Question 1

During an action potential, which event is primarily responsible for the rapid depolarization phase of the neuron membrane?

Accepted Answer

Opening of voltage-gated Na\+ channels

Question 2

Which of the following best describes saltatory conduction in myelinated axons?

Accepted Answer

Action potentials jump from one node of Ranvier to the next

Question 3

A neuron is in its absolute refractory period. What does this mean?

Accepted Answer

It cannot fire another action potential regardless of stimulus strength

Question 4

Which neurotransmitter release mechanism is triggered by an influx of Ca\^{2+} ions into the presynaptic terminal?

Accepted Answer

Exocytosis of neurotransmitter vesicles

Question 5

If a stronger stimulus is applied to a neuron, what effect does this have on neurotransmitter release at the synapse?

Accepted Answer

It increases the amount of neurotransmitter released

Question 6

Which type of postsynaptic potential causes hyperpolarization of the postsynaptic membrane?

Accepted Answer

Inhibitory postsynaptic potential (IPSP)

Question 7

Which structure in the central nervous system is responsible for producing cerebrospinal fluid (CSF)?

Accepted Answer

Choroid plexus

Question 8

Gray matter in the spinal cord primarily contains which of the following?

Accepted Answer

Neuron cell bodies and dendrites

Question 9

Which of the following is a function of the hypothalamus?

Accepted Answer

Regulation of homeostasis and hormone release

Question 10

Which anterior pituitary hormone is considered tropic?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 11

Which functional area of the cerebral cortex is primarily responsible for processing somatic sensory information?

Accepted Answer

Primary somatosensory cortex

Question 12

Transduction in sensory physiology refers to which process?

Accepted Answer

Conversion of a stimulus into a change in membrane potential

Question 13

Which of the following best describes the concept of 'adequate stimulus' for a sensory receptor?

Accepted Answer

The specific type of stimulus to which a receptor is most sensitive

Question 14

Which pathway correctly traces somatic sensation from the receptor to the somatosensory cortex?

Accepted Answer

Primary neuron $$ \rightarrow $$ secondary neuron $$ \rightarrow $$ tertiary neuron

Question 15

Which of the following is an example of a mechanical stimulus detected by sensory receptors?

Accepted Answer

Pressure

Question 16

According to the gate control theory of pain, how do inhibitory interneurons affect pain perception?

Accepted Answer

They block the transmission of pain signals by inhibiting projection neurons

Question 17

Which of the following best explains why slow pain is perceived differently from fast pain?

Accepted Answer

Slow pain is carried by unmyelinated C fibers, while fast pain is carried by myelinated A\delta fibers

Question 18

Which equation best represents the change in membrane potential during an action potential?

Accepted Answer

$$ V_m = V_{rest} + \Delta V_{Na^+} + \Delta V_{K^+} $$

Question 19

Which of the following is true regarding the blood-brain barrier?

Accepted Answer

It is formed by tight junctions between endothelial cells

Question 20

Which of the following best describes the role of lateral inhibition in sensory processing?

Accepted Answer

It sharpens sensory perception by inhibiting neighboring neurons

Anatomy & Physiology Study Guide: Nervous System and Sensory Physiology (Chapters 8-10)

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