Question 1

Which of the following is primarily responsible for initiating action potentials in neurons?
Correct answer: Sodium ions (Na+)

Accepted Answer

Sodium ions (Na+)

Question 2

A patient is exposed to a toxin that causes prolonged opening of chloride channels in the postsynaptic membrane. What is the most likely effect on the neuron's ability to generate action potentials?
Correct answer: The neuron will become less likely to fire action potentials due to hyperpolarization.

Accepted Answer

The neuron will become less likely to fire action potentials due to hyperpolarization.

Question 3

Which of the following best explains why the resting membrane potential is maintained in neurons?
Correct answer: Selective permeability of the cell membrane and the sodium-potassium pump

Accepted Answer

Selective permeability of the cell membrane and the sodium-potassium pump

Question 4

During the relative refractory period of an action potential, which of the following is true?
Correct answer: A stronger-than-normal stimulus is required to trigger another action potential due to potassium efflux.

Accepted Answer

A stronger-than-normal stimulus is required to trigger another action potential due to potassium efflux.

Question 5

Which of the following statements about the all-or-none principle is correct?
Correct answer: It applies to all excitable membranes, meaning an action potential either occurs fully or not at all.

Accepted Answer

It applies to all excitable membranes, meaning an action potential either occurs fully or not at all.

Question 6

A person enters a dark room and, after several minutes, notices their eyes have become more sensitive to the dim light. Which type of sensory receptor is primarily responsible for this adaptation?
Correct answer: Tonic receptors

Accepted Answer

Tonic receptors

Question 7

Which cranial nerve is purely sensory among the following?
Correct answer: Optic nerve

Accepted Answer

Optic nerve

Question 8

Which of the following structures is responsible for coordinating eye movements when tracking a moving object?
Correct answer: Superior colliculi

Accepted Answer

Superior colliculi

Question 9

Which of the following best describes the function of pericytes in the nervous system?
Correct answer: They regulate blood flow and help maintain the blood-brain barrier.

Accepted Answer

They regulate blood flow and help maintain the blood-brain barrier.

Question 10

Which of the following is NOT allocated a large area in the somatosensory cortex?
Correct answer: Gums

Accepted Answer

Gums

Question 11

Which type of sensory receptor is responsible for detecting changes in temperature and pain?
Correct answer: Free nerve endings

Accepted Answer

Free nerve endings

Question 12

Osmoreceptors are best classified as which type of receptor?
Correct answer: Interoceptors

Accepted Answer

Interoceptors

Question 13

Which of the following statements best distinguishes graded potentials from action potentials?
Correct answer: Graded potentials vary in magnitude with stimulus strength, while action potentials are all-or-none.

Accepted Answer

Graded potentials vary in magnitude with stimulus strength, while action potentials are all-or-none.

Question 14

Which of the following is a unique property of cardiac muscle cells that allows the heart to beat without external nervous input?
Correct answer: Spontaneous generation of action potentials by pacemaker cells

Accepted Answer

Spontaneous generation of action potentials by pacemaker cells

Key Concepts in Neurophysiology and Sensory Systems

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