Neuroscience

What are neurons?

Neurons are the basic units of the nervous system that transmit information through electrical and chemical signals.

What are the main parts of a neuron?

The main parts of a neuron include dendrites, cell body (soma), axon, and axon terminals.

What is the function of myelin?

Myelin insulates the axon and speeds up signal transmission.

What is an action potential?

An action potential is an electrical impulse that travels down the axon to transmit a signal.

What are neurotransmitters?

Neurotransmitters are chemicals that transmit signals across a synapse to another neuron or target cell.

What is a synapse?

A synapse is a gap between neurons where neurotransmitters are released.

List the steps of neural communication.

1. Dendrites receive input. 2. Signal is processed in the soma. 3. Action potential travels down the axon. 4. Neurotransmitters are released at axon terminals. 5. Signal is passed across the synapse.

What is resting membrane potential (Vm)?

Resting membrane potential (Vm) is maintained by the Na+/K+ pump and leak channels, making the inside of the neuron more negative compared to the outside.

What is depolarization?

Depolarization is when the inside of the cell becomes less negative, typically due to Na+ entering.

What is hyperpolarization?

Hyperpolarization is when the inside of the cell becomes more negative, usually due to K+ leaving or Cl- entering.

What is the threshold potential?

The threshold potential is the membrane potential that triggers an action potential, typically around -55 mV.

What happens during action potential generation?

During action potential generation, voltage-gated Na+ channels open when the threshold is reached, allowing Na+ influx (depolarization), followed by opening of voltage-gated K+ channels to repolarize the cell.

What are neurons?

Neurons are the basic units of the nervous system that transmit information through electrical and chemical signals.

What are the main parts of a neuron?

The main parts of a neuron include dendrites, cell body (soma), axon, and axon terminals.

What is the function of myelin?

Myelin insulates the axon and speeds up signal transmission.

What is an action potential?

An action potential is an electrical impulse that travels down the axon to transmit a signal.

What are neurotransmitters?

Neurotransmitters are chemicals that transmit signals across a synapse to another neuron or target cell.

What is a synapse?

A synapse is a gap between neurons where neurotransmitters are released.

List the steps of neural communication.

1. Dendrites receive input. 2. Signal is processed in the soma. 3. Action potential travels down the axon. 4. Neurotransmitters are released at axon terminals. 5. Signal is passed across the synapse.

What is resting membrane potential (Vm)?

Resting membrane potential (Vm) is maintained by the Na+/K+ pump and leak channels, making the inside of the neuron more negative compared to the outside.

What is depolarization?

Depolarization is when the inside of the cell becomes less negative, typically due to Na+ entering.

What is hyperpolarization?

Hyperpolarization is when the inside of the cell becomes more negative, usually due to K+ leaving or Cl- entering.

What is the threshold potential?

The threshold potential is the membrane potential that triggers an action potential, typically around -55 mV.

What happens during action potential generation?

During action potential generation, voltage-gated Na+ channels open when the threshold is reached, allowing Na+ influx (depolarization), followed by opening of voltage-gated K+ channels to repolarize the cell.

What is a glial cell?

Glial cells support and protect neurons, playing a crucial role in maintaining homeostasis.

What are the types of glial cells?

The main types of glial cells are astrocytes, oligodendrocytes, microglia, and radial glia.

What is the role of astrocytes?

Astrocytes help maintain the blood-brain barrier, provide nutrients to neurons, and repair brain injuries.

What is the function of oligodendrocytes?

Oligodendrocytes produce myelin in the central nervous system, insulating axons.

What are microglia?

Microglia are the immune cells of the central nervous system, involved in the response to injury and disease.

What is the role of radial glia?

Radial glia guide the migration of neurons during brain development.

What is a neurotransmitter receptor?

A neurotransmitter receptor is a protein that binds to neurotransmitters and mediates their effects on the postsynaptic neuron.

What is reuptake in neural communication?

Reuptake is the process by which neurotransmitters are reclaimed by the presynaptic neuron after transmitting a signal.

What is the role of calcium ions (Ca2+) in neurotransmitter release?

Calcium ions trigger the fusion of neurotransmitter-containing vesicles with the presynaptic membrane, leading to neurotransmitter release.

What is synaptic plasticity?

Synaptic plasticity is the ability of synapses to strengthen or weaken over time, crucial for learning and memory.

What is long-term potentiation (LTP)?

Long-term potentiation is a lasting increase in synaptic strength, often associated with learning.

What is long-term depression (LTD)?

Long-term depression is a lasting decrease in synaptic strength, important for memory and learning.

What is the difference between the central nervous system (CNS) and peripheral nervous system (PNS)?

The CNS consists of the brain and spinal cord, while the PNS includes all the nerves outside the CNS.

What is the function of the spinal cord?

The spinal cord transmits signals between the brain and the rest of the body and coordinates reflexes.

What is a reflex arc?

A reflex arc is a neural pathway that controls a reflex action, usually consisting of a sensory neuron, interneuron, and motor neuron.

What are sensory neurons?

Sensory neurons transmit sensory information from the peripheral body to the CNS.

What are motor neurons?

Motor neurons carry signals from the CNS to muscles and glands to elicit a response.

What is the role of interneurons?

Interneurons connect sensory and motor neurons within the CNS, processing information and coordinating responses.

What is the function of the hypothalamus?

The hypothalamus regulates homeostasis, including temperature, hunger, and sleep.

What is the role of the cerebellum?

The cerebellum coordinates voluntary movements, balance, and posture.

What is the function of the thalamus?

The thalamus acts as a relay station for sensory and motor signals to the cerebral cortex.

What is the function of the cerebral cortex?

The cerebral cortex is involved in higher brain functions, including thought, perception, and decision-making.

What is the significance of the corpus callosum?

The corpus callosum connects the left and right hemispheres of the brain, facilitating communication between them.

What is neurogenesis?

Neurogenesis is the process of generating new neurons, primarily occurring in the hippocampus.

What is the function of the pituitary gland?

The pituitary gland is the master gland that regulates various hormones in the body, influencing growth and metabolism.

What is the autonomic nervous system?

The autonomic nervous system controls involuntary bodily functions, such as heart rate and digestion.

What are the two divisions of the autonomic nervous system?

The two divisions are the sympathetic nervous system and the parasympathetic nervous system.

What is the fight or flight response?

The fight or flight response is a physiological reaction triggered by the sympathetic nervous system in response to perceived threats.

What is the rest and digest response?

The rest and digest response is a physiological reaction mediated by the parasympathetic nervous system, promoting relaxation and digestion.

What is the peripheral nervous system made of?

The peripheral nervous system consists of cranial nerves, spinal nerves, and ganglia.

What is the somatic nervous system?

The somatic nervous system controls voluntary movements and transmits sensory information to the CNS.

What is the role of the enteric nervous system?

The enteric nervous system regulates gastrointestinal functions and operates independently of the CNS.

What is the blood-brain barrier?

The blood-brain barrier is a selective permeability barrier that protects the brain from harmful substances in the bloodstream.

What are action potentials used for?

Action potentials are used for rapid signal transmission in neurons.

What is the all-or-nothing principle?

The all-or-nothing principle states that an action potential either occurs fully or not at all if the threshold potential is reached.

What are ligand-gated ion channels?

Ligand-gated ion channels are proteins that open or close in response to binding of a specific neurotransmitter.

What are voltage-gated ion channels?

Voltage-gated ion channels open or close in response to changes in membrane potential.

What is the significance of the refractory period?

The refractory period is the time after an action potential during which a neuron cannot fire again, ensuring unidirectional signal flow.

What happens during repolarization?

During repolarization, voltage-gated K+ channels open, allowing K+ to leave the cell and restoring the negative membrane potential.

What are graded potentials?

Graded potentials are small changes in membrane potential that can vary in size and are not all-or-nothing.

What is convergence in neural circuitry?

Convergence is when multiple neurons synapse onto a single neuron, allowing for integration of signals.

What is divergence in neural circuitry?

Divergence is when a single neuron synapses onto multiple neurons, amplifying the signal.

What is transduction in sensory systems?

Transduction is the process of converting a stimulus into an electrical signal in sensory neurons.

What is the effect of long-term stress on neurons?

Long-term stress can lead to neuron damage and impair cognitive functions.

What is the role of acetylcholine?

Acetylcholine is a neurotransmitter involved in muscle activation, attention, and memory.

What neurotransmitter is primarily associated with mood regulation?

Serotonin is primarily associated with mood regulation, as well as sleep and appetite.

What is dopamine involved in?

Dopamine is involved in reward processing, motivation, and motor control.

What neurotransmitter is associated with the fight or flight response?

Norepinephrine is associated with the fight or flight response, increasing alertness and energy.

What is the function of glutamate?

Glutamate is the main excitatory neurotransmitter in the brain, involved in learning and memory.

What is GABA?

GABA (gamma-aminobutyric acid) is the main inhibitory neurotransmitter in the brain, reducing neuronal excitability.

What is the function of endorphins?

Endorphins are neurotransmitters that act as natural painkillers and are associated with feelings of pleasure.

What is the role of the vagus nerve?

The vagus nerve regulates involuntary body functions, including heart rate and digestion.

What is the impact of myelin sheath damage?

Damage to the myelin sheath can disrupt signal transmission, leading to neurological disorders.

What is sensory adaptation?

Sensory adaptation is the process by which sensory receptors become less sensitive to constant stimuli over time.

What is the significance of the limbic system?

The limbic system is involved in emotion, behavior, and memory formation.

What is the function of the amygdala?

The amygdala is involved in processing emotions, especially fear and pleasure.

What is the role of the hippocampus?

The hippocampus is critical for the formation of new memories and spatial navigation.

What are mirror neurons?

Mirror neurons activate when an individual performs an action and when they observe others performing the same action, playing a role in empathy and learning.

What is brain plasticity?

Brain plasticity is the ability of the brain to reorganize itself by forming new neural connections throughout life.

What is the function of neurotransmitter antagonists?

Neurotransmitter antagonists block the action of neurotransmitters at their receptors, inhibiting signal transmission.

What is the function of neurotransmitter agonists?

Neurotransmitter agonists stimulate receptors, enhancing the effects of neurotransmitters.

What is the significance of the superior colliculus?

The superior colliculus is involved in visual processing and eye movement control.

What is the function of the inferior colliculus?

The inferior colliculus is involved in auditory processing.

What is the role of the basal ganglia?

The basal ganglia are involved in motor control, reward, and learning.

What is the primary role of the brainstem?

The brainstem controls vital life functions, such as breathing, heart rate, and sleep-wake cycles.

What are the functions of the medulla oblongata?

The medulla oblongata regulates autonomic functions, including breathing and heart rate.

What is the role of the pons?

The pons acts as a bridge between different parts of the nervous system, particularly in relaying signals between the cerebellum and the cerebrum.

What is the function of the raphe nucleus?

The raphe nucleus is involved in the regulation of mood, sleep, and arousal through serotonin production.

What is the significance of the reticular formation?

The reticular formation regulates arousal and attention, influencing states of consciousness.

What are tactile receptors?

Tactile receptors are sensory receptors that respond to touch, pressure, and vibration.

What are proprioceptors?

Proprioceptors provide information about body position and movement, allowing for coordination and balance.

What is the role of nociceptors?

Nociceptors are sensory receptors that respond to painful stimuli.

What is the impact of neurotransmitter release on target cells?

Neurotransmitter release leads to changes in the electrical activity of target cells, affecting their function.

What neurotransmitter is primarily involved in muscle contraction?

Acetylcholine is the primary neurotransmitter involved in muscle contraction at the neuromuscular junction.

What is the frequency of action potentials related to?

The frequency of action potentials is related to the strength of the stimulus; stronger stimuli produce more frequent action potentials.

What is the role of feedback inhibition?

Feedback inhibition is a regulatory mechanism where the output of a process inhibits its own production, maintaining homeostasis.