Receptive Field Concept
Commonality in neuron receptive fields exemplified by recognition of the face of Halle Berry.
Neuron's receptive field is activated by specific stimuli (e.g., Halle Berry).
Neurons may respond differently to stimuli that do and do not activate them (e.g., stimuli that fire vs. stimuli that don't).
Neurons in the same brain region share similar receptive fields:
Photoreceptors: Respond to dark spots in varied locations.
Neurons in Face Area: Respond to different facial feature combinations.
Hippocampus Neurons: Responsive to distinct aspects related to different individuals or places.
Input from photoreceptors collected by RGCs.
Use of electrodes to record action potentials from RGCs in response to visual stimuli:
Determine spatial response of the neuron.
Testing with black and white dots to understand the receptive field better.
Similar setup as Page 3, focusing on specific locations in the visual field.
Example of stimulant: white spot presented in a defined spatial location generates response from the RGC.
Goals listed for understanding muscle systems:
Differentiate between skeletal, smooth, and cardiac muscles in terms of structure.
Explain muscle contraction using the sliding filament model.
Predict the impact of acetylcholine-related perturbations on muscle contraction.
Discuss effects of stress on sympathetic vs. parasympathetic nervous systems (e.g., epinephrine, norepinephrine).
Sensory input processes:
Sensor: Receives information.
Sensory Neurons: Transmits signals.
Integration: Brain and spinal cord neurons synthesize information.
Motor Neurons: Activate muscles or glands.
Quiz on muscle presence:
Various options (A-D) regarding which structures contain muscle (e.g., Arm and Heart).
Emphasis on different muscle types present within structures.
Skeletal Muscle:
Attached to bones or skin (facial muscles); voluntary control.
Cardiac Muscle:
Found within the heart; involuntary control.
Smooth Muscle:
Located in the walls of hollow visceral organs (involuntary control).
Sarcomeres are organized filament stacks in muscles responsible for generating force.
Important terms:
Z Lines: Define boundaries of sarcomeres.
Measurement: Sarcomere spans approximately 0.5 mm.
Visible distinctions in muscle types:
Skeletal Muscle: Exhibits darker banding.
Cardiac Muscle: Also shows banding.
Smooth Muscle: Lacks sarcomeres.
Listed same motor system learning goals from Page 5 for review.
Overview of skeletal muscle structure:
Each muscle cell termed a muscle fiber.
Comprised of numerous myofibrils divided into sarcomeres.
Terms of anatomy:
Plasma membrane, Z-lines, myofibril, and sarcomere detailed.
Description of contraction process:
Muscles convert ATP into movement via contraction.
Filaments (actin and myosin) slide over one another to reduce muscle cell length.
Electron micrograph focus on the sarcomere components:
Thick Filaments: Myosin.
Thin Filaments: Actin.
Clarification of other activities in relation to sarcomere structure (e.g., M line, A bands).
During contraction, thick and thin filaments slide together:
Observable changes in A bands, I bands, H zones, and Z lines during muscle contraction.
Visualization of fully relaxed vs. fully contracted sarcomere.
Highlighting that thick and thin filaments move closer during contraction, yet do not change in length.
Only sarcomeres shorten during muscle contraction; neither actin nor myosin filaments change length but overlap increases.
Reiteration of motor system learning goals for review before the exam.
Essential components for muscle fiber contraction:
Both ATP and calcium needed inside the fiber for functioning.
Sequence of activation:
Neuron generates action potential, activates neuromuscular junction.
Muscle fiber receives AP, signal spreads.
Muscle contracts using cross-bridge cycling.
Examining the structure of muscle fibers:
Each muscle fiber connects to one neuron at the neuromuscular junction (NMJ).
Acetylcholine serves as the primary neurotransmitter in skeletal muscle.
Order of steps detailing acetylcholine activity at NMJ:
Acetylcholine binds, opening sodium channels.
Acetylcholine breaks down in the synaptic cleft.
Voltage-gated calcium channels open in neurons.
Summary steps of acetylcholine action at NMJ, noting importance of neurotransmitter in muscle activation.
Full description of acetylcholine functions at NMJ:
AP opens calcium channels in the neuron.
Calcium influx triggers acetylcholine release.
Acetylcholine binds to receptors on muscle fibers.
Breakdown of acetylcholine in the synaptic cleft.
Reflection prompt: Identify unclear points from the class for follow-up before final exams.
Homework list with due dates:
Midterm 4 study (due 3 or 4 PM, Mar. 5).
Biologist Journal assignments (due Mar. 5 and Mar. 6).
Quiz assignments due Mar. 8.
Alternative section assignments due Mar. 8.
Overview of muscle contraction, nerve stimulation, signal propagation, cross-bridge cycling, along with reflection and homework details.
Current state on completion targets for extra credit and number of participants needed for completion.
Reminder for final reflection due end of finals week encapsulating learned concepts that made a lasting impression.
Learning goals reviewed to prepare classification on muscular systems and nervous responses.
Repeat of steps for skeletal muscle contraction to reinforce learning for the students.
Acetylcholine causes depolarization through sodium channel activation in muscle.
Sorting through effects of sodium entering the muscle and the depolarizing impact on muscle contraction.
Detailing sequence in muscle action potential and voltage-gated sodium channel interactions during contraction phases.
Explanation of AP traveling down the muscle fibers and T-tubule structures to trigger contraction.
Sequence of events for muscle action potential covering resting, depolarization, repolarization, and return to rest points.
Function of T-tubules in facilitating signal propagation for the action potential through the muscle fibers.
Information about calcium release from the sarcoplasmic reticulum in muscle cells upon action potential arrival and its role in muscle contraction.
Focus on components necessary for muscle contraction, including the essential role of calcium ions.
Discussion about requirements of the muscle fiber for effective contraction highlighting calcium’s role.
Summarizing the anticipated learning objectives related to muscle contraction and autonomic nervous system identification.
Reviewing the sequence of skeletal muscle contraction points for warrior muscle understanding.
Understanding that muscle contraction stems from actin and myosin filament interactions.
Explanation of the microscopic level changes involved in the sliding filament model, with functions of myosin heads.
Detailed account of calcium's role in enabling actin and myosin interaction by removing tropomyosin hindrance.
Discussion of how ryanodine’s presence keeps calcium channels open, leading to constant muscle contraction and impacts.
Continuous activity implications on muscle and effects on contraction are reaffirmed in high calcium environment.
Clarification on the dual effect of calcium in neurons and muscle systems.
Understanding the ryanodine effectiveness in the context of calcium release causing persistent contraction in muscles.
Focus on calcium's presence and its fundamental role in acheiving muscle contraction mechanisms effectively.
Process for cross-bridge cycling elucidated with detailed steps from attachment to the returning state.
Increased clarity on each component's role in muscle contraction represented with visuals including actin and myosin interactions.
Response to instances of impulse cessation; accumulated understanding of how muscle contraction phases out gradually.
Explanation that the cessation of muscle contraction occurs as calcium levels return to baseline due to ending neural impulses.
Explanation of muscle stiffness postmortem related to ATP unavailability preventing cross-bridge detachment during rigor mortis.
Honor of potential causes of muscle stiffness and ATP’s vital role discussed for lay understanding of physiological phenomena.
In-depth look at how myosin's high energy state allows it to engage with actin, essential for sarcomere action.
Discussion of why living organisms do not exhibit complete muscle stiffness as seen in rigor mortis; roles of ATP and calcium elucidated.
Clarification on muscle activity by defining conditions favoring flexible contraction in living environments.
Contrasting the mechanism of muscle flexibility vs. rigidity examined through ATP presence and calcium storage dynamics.
Resources suggested for furthering understanding of muscle contraction mechanics through tutorials and guides.
Overview detailing goals associated with muscle growth physiology and factors influencing muscle responses.
Inquiry into which ANS division is responsible for stress-related pathways, categorizing responses as sympathetic or otherwise.
Representation of various individuals' contributions to successful outcomes in exams emphasized.
Diagram explanation outlining structures and division of PNS, highlighting telecommunications within central nervous systems.
Overview of two primary divisions of the autonomic nervous system:
Parasympathetic: "Rest and digest" functions, lower heart rate/blood pressure.
Sympathetic: "Fight or flight" instincts for survival, mobilizing energy for immediate action.
Recap presented contrasting the actions of sympathetic and parasympathetic divisions for clarity of functions.
Repeat of inquiry into stress pathways facilitating adaptive and physiological processes.
Further information on stress pathways, emphasizing the involvement of adrenal glands as mediators.
Explanation of adrenal gland functions under stress conditions, including cortisol and norepinephrine/epinephrine secretion.
Illustrated mapping of stress response pathways detailing hormonal impacts and considerations of neuroendocrine interactions.
Invitation to reflect on unclear concepts from class for revisiting prior to exam readiness.
Upcoming due dates outlined for quizzes, journals and reflections relating to course material.
Overview of the class agendas addressing autonomic nervous systems and behavior mechanisms.
Update on the goal progression percentage necessary for additional recognition.
Essential logistics concerning final exam dates, locations and seating arrangements communicated to students.
Instructions for completing extra credit surveys and associated deadlines.
Comprehensive review of previously established learning objectives relating to muscle and nervous systems.
Reassessment of stress pathways and their relevance to adaptive physiological processes.
Impact of epinephrine and norepinephrine noted in terms of cardiovascular and metabolic stress responses.
Illustration of stress symptomatology captured through diverse physiological manifestations.
Exploration of the efficacy of beta blockers in ameliorating stress response during assessments such as the SAT.
Summation of research findings affirming potential benefits and considerations in application for anxiety management.
Distinct learning goals encompassing innate and learned behavior themes articulated for clarity.
Innate and learned behavior definitions laid out for foundational understanding.
Use of an example of mother goose behavior relating to instinctive mechanics and innate response behavior.
Questions probing participants' discernment abilities regarding the classification of behaviors observed.
Engagement prompts for reflection on behavioral classification understandings among peers.
Reevaluation of instances of innate or learned behavior based on repetitive immediate reactions surrounding the situation.
Final determination that behaviors associated with innate responses often leverage survival instincts and cannot adapt to new contexts.
Summary outlining distinguishing factors between innate and learned behaviors.
Reaffirmed learning objectives focusing on neural connectivity and behavior differentiation dynamics in response to stimuli.
Exploration of responses regarding the physical dimensions accompanying cognition within educational settings.
Collation of diverse perceptions on learning-induced physiological responses noted in discussions.
Depiction of a controlled experiment detailing mice's reactions based on false memory stimuli.
Introduction of the foundational saying: "Neurons that fire together, wire together" for assessing synaptic strengthening.
Outlining the relationship of practice via motor activities (e.g., playing piano) with neuronal synergy strengthening.
Suggested methodologies for probing neuronal connections and resultant behaviors as linked to synaptic activation conditions.
Details of optogenetics and its implications for controlling neural firing to assess connectivity amongst neurons.
Explanation of ChR2 channel activation in neurons by blue light exposure to provoke firing behavior.
Breakdown of influx dynamics regarding sodium ions after light-induced channel opening results in neuron excitability.
Evaluation of whether sight influences optogenetic responses leading to neuronal firing as part of the discussion.
Reinforcement that optogenetic effects on neurons are independent of visual perception mechanisms.
Inquiry detailing the feasibility of inducing neuronal firing in non-rodent subjects when subjected to externals such as blue-light stimuli.
Note that gene expression is necessary for ChR2 activation within the neuron frameworks exploring acceptable experimental conditions.
Recap of proposed experimental designs highlighting methods for analyzing pairing and synaptic wiring among neurons.
Overview of hippocampal neurons' contextual responsiveness to designated stimuli associated with location or situation.
Explanation of variations in neuronal responses across different locations by articulating the selective firing when stimuli presence occurs.
Continuation of different neuronal firing potentials when various situations relate to basic discrete location engagements.
Strategy discussed for generating firing in specific context neurons through controlled experimental triggers.
Essence of natural activation of neurons within test subjects outlined providing context to external treatments.
Focus on distinguishing specific neuronal subsets based on traits determined methodically by genetic adjustments in the experimental setup.
Diagrammatic representation delineating active elements in the experiment connecting experimental variables interacting with hippocampal neurons.
Evaluation of which neuronal set is activated under specific contexts incorporating both controlled and spontaneous reactions.
Analysis of which neurons are involved under distinctly defined conditions explored in previous questions.
Invitation to share insights regarding points needing clarity from each session prior to final evaluations.
Consolidated list of upcoming assignments with respective due dates for monitoring progress and engagement.
Coverage topics involving further inquiry into adaptive and innate immunity behaviors and responses.
Monitor current standings and adjustments targeting completion rate for the credited objectives successfully.
Look into evaluation processes fostering active discourse regarding functional assessments coming from neuronal activity data.
Assessment of how neuro-triggering via light can possibly activate unforeseen pathways for connecting neurons in research.
Focusing on specific neuronal networks that fire concurrently during multi-tiered stimuli such as foot shock and light.
Recognition of combined impacts from external stimuli establishing synaptic strength and interconnectivity between distinct neuron populations.
Conclusive assessments dwelling on developments post-exposure regarding possible memory restructuring through behavioral observations.
Analyzing qualitative indicators used in assessing the efficacy of neuron pairing under experimental conditions.
Critical follow-up of previous experiment outputs showcasing interconnected neuron activity through synaptic firing communication.
Summary reflecting pairs' neural connections and their constructed strength from experience conditioning pathways and the consequent outcomes.
Reinforcement of connections observed between distinct neuronal pathways and footprints created through experimental paradigms.
Broadening discussions regarding registrations of neuron sets about contextual influences highlighting shifting patterns.
Providing feedback into which characteristics define more common pathways of immune interaction through neuronal dialogue and firing schemes.
Deep-dive into synaptic changes, highlighting foundational learning premises tied into synaptic adaptability and plasticity dimensions.
Overview documenting shifts in synapses and adaptive capacities intersecting learning experiences recorded through behavioral data points.
Discussion investigating how synapses strengthen or weaken through neuronal processing & firing patterns from observational or experimental stimuli.
Examination of synaptic action from Arc and potential influences it plays in memory retention through protections of receptor pathways.
Engaging discussions on how learning dynamically alters synaptic interactions through structural and functional perspectives within neurons.
External links suggested enhancing a deeper understanding of synaptic plasticity highlighted by trusted enhancement sources.
Stipulations regarding identifying immune system functions outlining responses concerning pathogen recognition and adaptive reactions.
Recapping overarching mechanisms which bodies utilize against infections through innate and adaptive immune functionalities.
Diagram illustrating phases in recognizing pathogens and the immune system’s multilayered responses occurring in the aftermath.
Clarification between innate immune responses vs adaptive processes stressing timing and specificity paramount in reactionary measures.
Utilization of analogy contrasting innate with adaptive immune responses in different environmental scenarios detailing personal safety precautions replication.
Summarization of anticipated learning outcomes demonstrated in immune system functionality recognizing innate and adaptive process variations.
Overview of innate immune protective attributes including physiological barriers such as the skin and additional bodily defenses.
Summary detailing central immune cells such as macrophages and neutrophils' roles in pathogen engagement and immune recruitment.
Analysis of possible consequences if macrophages are congenitally absent noting implications for innate immune response efficacy.
Linkage emphasizing that macrophages hold a pivotal role in maintaining connectivity pertinent to overall immune resilience and health.
Description illustrating innate immune cells' efficacious interactions in targeting intruders irrespective of prior exposure to stimuli or antigens.
Understanding how innate immune cells recognize invaders versus endogenous cells enables effective phagocytosis united with swift responses.
Introduced concept surrounding the identification of pathogens in relation to PAMPs as innate system identifiers relevant in adaptive response frameworks.
Examination of PAMP and TLR interplay within various class distributions reinforcing recognition properties inherent in innate immune cells.
Given task contextualizes impacts of mutation susceptibility tied specifically to innate immune processes rather than adaptive.
Overview documenting specific distinctions segregating immune response variability insights into genetic modifications enriching understanding of innate interactions.
Consolidating mechanisms enumerated through proactive responses, including microbiological eliminations as part of innate immune responses.
Recognizing core understanding of progressive distinctions between innate and adaptive immune functionalities postulated framework initiatives.
Explicit recapitulations documenting differences in timing and specificity guiding innate versus adaptive immune response approaches.
Clarifications outlining distinctions between PAMPs and pathogen-specific antigen compositions noted in previous notes and immune responses.
Narrative detailing hierarchical construction of antibodies towards antigens from adaptive immune responses typified by their specificity related to pathogens.
Exposition on antibody response viability towards mutated pathogens underscoring variability in adaptability concerning classical viral infections.
Consolidated assignments due detailing multiple submissions from biologist journals to surveys and review final study plans.
Invitations to note unclear constructs from the day’s learnings with prompts to examine any contradictory perspectives received.
Outlining critical subjects focused on adaptive immunity educational trajectories and overarching connections to study reflections.
Current metrics provided tracking initiatives demonstrating reach towards set class completion objectives finalized for recognition opportunities.
Threading the impact of variability within immunological channels linked to potential susceptibility towards different pathogens through inquiry evaluations.
Exploration of core understanding regarding adaptive mechanisms and hyper-efficient engagement within immune response frameworks building immunity.
Cascade of interactions noted regarding the immune system functionalities with a focus on behavioral identification of pathogens through multi-faceted interactions.
Summary displaying the communicative interactions surrounding helper T-cells and their interactive components shaping filtering immune reactions.
Narratively critiquing the bifurcation between cell-mediated and humoral arms exhibiting adaptive immune functionality using practical framework examples.
Elucidation upon challenges in adaptive immune processes against intracellular pathogens demonstrating specific immune response dynamics.
Critically defining how segmented responses uphold variant require mutual cooperation to engage threats reported from pathogen exposures.
Outlining the upper operational spectrum of immunity embedded within innate responses showcases added layers from innate immunity to adaptive nuances addressing viral infections.
Recap of primary phases illustrating adaptive immune functions culminating in memory formations resisting pervading infections through identification premises.
Outlining objectives emphasizing the necessity for clarity with each facet's pronounced learning objectives to be adhered to during immunology studies.
Distinction molded vis-à-vis mixed engagement types wherein previous exposures can lead to future rapid responses harnessed through conceptual applications in the courses.
If antibodies were administered, the rapid building of memory cells enhances protective measures reinvented and directly correlated with responses in evolving contexts involving seasonal flu strains.
Focus on the sequence of immune events correlated via vaccination pathways whereby antibodies spindle memories engaged post-inoculation dynamics engage long-term immunity.
Rosy juxtaposition laid between enrollment pathways into the immune system and underlying operational features inherited from traditional vaccine milieus versus advances in mRNA adaptation.
Insights into the roles mRNA vaccines play upon cellular entry augmenting traditional techniques generating pathogen recognition and antigen production.
Presentation opening gates to memory cells toward the burgeoning importance of dendritic cells transmitting required knowledge on pathogens through vaccination efforts.
Glossary included for mRNA vaccine definitions alongside potent reminders capturing cellular manipulations identifying biomolecular influence engagement from leading-edge immunotherapy across future discussions.
Reiteration of adaptive learning system objectives within immune frameworks stressing innate adaptability variance defined through cellular engagements and responses.
Overview assessment outlining whether antibodies could distinguish pathogenic structures deviating from self-states based upon cellular interactions detailed in earlier discussions.
Forward-looking developments probing the necessary increments regarding treatment implications channeling responses targeted towards autoimmunity incidents.
Mechanisms laid bare regarding self-tolerance across autoreactive cells hinting at potential pathways concerning autoimmune conditions ensuring clarity within newly acquired mechanisms.
Specifics chilled out outlining how self-tolerance nurtured across immune cells neutralizes autoreactive cells during T and B cell developments.
Evaluation surrounding humane treatment paths how gene interactions rooted within self-tolerance dependencies are crucial for holistic immune function.
Focus on identifiable connections linking pathogen exposure associations providing common grounds potentially leading to autoimmune developments.
Summary detailing recognized triggers within autoimmunity noted through identifying pathogen vs self-antigen variances contributing to immune dysfunction.
Documenting forward-thinking perspectives directing the evaluation across future biological conceptions from various disciplines engaging within BILD frameworks.
Summary outlining opportunities available within UCSD’s vast resources encouraging active community engagement and research availability.
Engagement recommendations towards securing introductory research positions accentuating paths for developmental growth and early opportunities.
Best approaches suggested based on experience securing successful connections presenting opportunities in language and volunteerism merits inviting respect in academic circles.
Summation expressing gratitude for shared educational experiences across the course duration leading to greater collaborative learning involvements.
Final prompt requesting clarification on hazed topics expressed in learning for aggregate understanding driven by directness and transparency.
Wrap-up of final homework assignments listed concisely driving associated deadlines fostering reflective learning through continued intakes and outputs.