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Sodium-potassium exchange pump
Moves sodium and potassium ions against large concentration gradients, pumping two potassium ions into the cell and three sodium ions out.
Threshold stimulus
The smallest amount of stimulation needed to initiate a response.
Action potential
A sequence of changes that alters and restores the resting membrane potential.
Tactile discs
Material that challenges touch sense and verbal description abilities.
Tactile corpuscles
Structures in the skin detecting light touch.
Meissner corpuscle
Touch-sensitive nerve endings detecting light touch and texture changes.
Ruffini corpuscles
Mechanoreceptors responding to stretch and movement.
Smooth muscle
Moves substances in various tracts, with unique cellular characteristics.
Cardiac muscle
Found in the heart, responsible for pumping blood and maintaining blood pressure.
Skeletal muscle
Associated with the skeleton, producing movement and supporting organs.
Skeletal muscle structure
Epimysium, perimysium, and endomysium layers surrounding muscle fibers.
Muscle contraction events
Series of steps from ACh release to muscle relaxation.
Increase in oxygen consumption
Due to physical activity, fever, stress, illness, cold temperatures, hyperthyroidism.
Rigor mortis
Fixed muscular contraction after death due to ATP depletion.
Muscles near sacral region
Piriformis, Coccygeus, Gluteus maximus, Multifidus lumborum, erector spinae.
Muscles near cervical region
Sternocleidomastoid, Scalene Muscles, Trapezius, Levator Scapulae, Longus Colli, Longus Capitis.
Resting muscle ATP generation
Primarily through aerobic respiration.
Aerobic respiration
Main energy source for cardiac and smooth muscle tissue.
Anaerobic respiration
Breakdown of sugars to generate energy without oxygen.
Aerobic exercise effects
Heart pumps oxygenated blood to working muscles for extended performance.
Anaerobic glycolysis
Breakdown of glucose to lactic acid without oxygen.
Nervous system functions
Guides activities, from automatic to complex processes.
Spinal nerves
Transmit signals between brain, spinal cord, and body.
Central nervous system
Comprises the brain and spinal cord.
Peripheral nervous system
Includes nerves and ganglia outside the brain and spinal cord.
Perineurium
Connective tissue layer surrounding nerve fascicles in the PNS.
Efferent division
Carries motor commands from CNS to PNS muscles and glands.
Somatic nervous system
Controls voluntary and reflex skeletal muscle contractions.
Afferent system function
Transmits sensory information to the CNS.
Ulnar nerve location
Starts at the brachial plexus, connects to C8 and T1 vertebrae, runs down the upper arm.
Filum terminale
Nonfunctional continuation of the spinal cord end.
White matter of spinal cord
Composed of myelinated axonal tracts.
Dorsal ramus
Carries nerve axons for deep muscles and skin of the trunk.
Somatic motor nuclei location
Upper part of the midbrain at the level of the superior colliculus.
Dorsal root ganglia content
Mainly synapses.
Neuroglia functions
Provide support, protection, and defense to nervous tissue.
PNS glial cells
Schwann cells, satellite cells, enteric glia.
CNS glial cells
Oligodendrocytes, astrocytes, ependymal cells, microglia.
Astrocytes functions
Create framework, maintain blood-brain barrier, regulate interstitial environment, guide neuron development.
Schwann cells functions
Form myelin sheath around axons in the PNS.
Satellite cells
Surround neurons in ganglia.
Structural classification of neurons
Multipolar, bipolar, unipolar.
Postsynaptic neuron
Receives neurotransmitter signals from a presynaptic neuron.
Presynaptic neuron
Releases neurotransmitter at a synapse for communication.
Cholinergic synapse transmission steps
Action potential, calcium entry, neurotransmitter release, depolarization, acetylcholine breakdown.
Neuron action potential generation
Depends on depolarization to threshold ion balance.
Action potential generation steps
Depolarization, Na+ channels activation, K+ channels activation, return to resting potential.
Sodium channels opening in axon membrane
Causes depolarization.
Neuron repolarization
Potassium channels allow potassium out of the cell.
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Preganglionic Neurons
Neurons of the autonomic nervous system located in the visceral efferent (lateral gray) column of the spinal cord.
Ganglionic Neurons
Part of the autonomic nervous system located in ganglia outside the central nervous system, relaying information from preganglionic neurons to target organs.
Preganglionic Fibers
Fibers that synapse inside the sympathetic ganglia when leaving the central nervous system.
Sympathetic Preganglionic Neurons
Short, myelinated neurons extending from the thoracic and superior lumbar segments of the spinal cord, with cell bodies in the lateral horns between T1 and L2.
Parasympathetic Nervous System
Responsible for rest and digestion responses, decreasing respiration and heart rate while increasing digestion.
Sympathetic Nervous System
Dilates blood vessels, increases blood pressure, contracts muscles, and regulates various bodily functions.
Dual Innervation
Organ instruction from both sympathetic and parasympathetic systems.
Thoracolumbar Division
Sympathetic part of the autonomic division originating in the intermediolateral cell column of the spinal cord.
Autonomic Nervous System and Pupil Contraction
Controls pupil contraction through its sympathetic and parasympathetic divisions.
General Senses
Include pain, temperature, touch, pressure, vibration, and proprioception.
Proprioceptors
Monitor joint and muscle positions, a type of somatic sensation.
Chemoreceptors
Respond to dissolved substances in body fluids, monitoring pH, carbon dioxide, and oxygen levels.
Baroreceptors
Respond to pressure changes in distensible organs like blood vessels.
Thermoreceptors
Temperature receptors located in various body parts, conducting sensations of heat and cold.
Sensory Stimuli
Include visual, auditory, olfactory, gustatory, and tactile sensations.
Sensory Input Blockage
Factors like physical barriers, nerve damage, disorders, and environmental conditions can block sensory input.
Muscarinic Receptors
Found in the parasympathetic and some sympathetic systems, causing indirect responses via enzyme activation.
Nicotinic Receptors
Found in somatic motor and autonomic ganglion cells, leading to excitation upon activation.
Olfactory Bulb
Brain structure processing smell information and sending signals for perception and memory.
Taste Receptors
Primarily located on the tongue and play a role in detecting different tastes.
Iris Function
Controls pupil size and regulates light entering the eye.
Lens Function
Focuses light by changing shape through accommodation for clear vision at different distances.
Tears Function
Collect in the lacrimal lake, pass through ducts, and help maintain eye health.
Vascular Tunic Function
Provides blood supply, regulates light, maintains eye temperature, and secretes aqueous humor.
Aqueous Humor Production
Produced by the ciliary body in the eye.
Fibrous Tunic
Provides eye support, consists of the cornea and sclera.
Ciliary Body Functions
Attaches to the iris, changes lens curvature, and secretes aqueous humor.
Tympanic Membrane Function
Separates the external ear from the middle ear.
Inner Ear Function
Converts sound into nerve impulses.
Saccule and Utricle Function
Responsible for position and linear movement sensations.
Endolymph
Responds to rotational head movements in the semicircular canals.
Otoliths Function
Calcium crystals aiding in gravity and linear acceleration detection.
Outer Ear Function
Collects and channels sound waves to the tympanic membrane.
Auditory Tube Function
Connects the middle ear to the pharynx, equalizing air pressure and draining mucus.
Brain Protection
Supported by the cranium, meninges, and cerebrospinal fluid.
Meninges
Three layers surrounding the brain, protecting it from trauma.
Cerebrospinal Fluid (CSF)
Fluid surrounding the CNS, exchanging with brain interstitial fluid.
Thalamus Function
Sensory relay center for all sensory information except olfaction.
Medulla Oblongata Regulation
Regulates autonomic and respiratory functions.
Hypothalamus
Controls autonomic functions and skeletal muscle.
Cerebral Aqueduct Function
Allows cerebrospinal fluid flow between ventricles.
Sensory Areas in Cerebrum
Primary areas for vision, hearing, smell, and taste processing.
Vestibulocochlear Nerve Function
Carries balance and equilibrium sensory information.
Cranial