Question 1

Which of the following best explains why sodium ions (Na+) are crucial for the initiation of action potentials in neurons?
Correct answer: Their influx depolarizes the membrane, triggering the action potential.

Accepted Answer

Their influx depolarizes the membrane, triggering the action potential.

Question 2

A patient is exposed to a toxin that causes prolonged opening of chloride channels in their neurons. What is the most likely effect on neuronal excitability?
Correct answer: The neuron will become less likely to fire due to hyperpolarization.

Accepted Answer

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

Question 3

Which of the following is NOT a direct contributor to the resting membrane potential of a neuron?
Correct answer: Synaptic transmission

Accepted Answer

Synaptic transmission

Question 4

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

Accepted Answer

Tonic receptor

Question 5

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

Accepted Answer

A stronger-than-normal stimulus is required due to potassium efflux.

Question 6

Which of the following best describes the 'all-or-none' principle as it applies to excitable membranes?
Correct answer: An action potential either occurs fully or not at all.

Accepted Answer

An action potential either occurs fully or not at all.

Question 7

A patient experiencing a myocardial infarction (heart attack) reports pain in their jaw. This phenomenon is best explained by which concept?
Correct answer: Referred pain

Accepted Answer

Referred pain

Question 8

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

Accepted Answer

Optic nerve

Question 9

Which of the following best distinguishes graded potentials from action potentials?
Correct answer: Graded potentials vary in magnitude with stimulus strength.

Accepted Answer

Graded potentials vary in magnitude with stimulus strength.

Question 10

Which brain structure is primarily responsible for coordinating eye movements, especially when tracking moving objects?
Correct answer: Superior colliculi

Accepted Answer

Superior colliculi

Question 11

Which of the following is a function of pericytes in the central nervous system?
Correct answer: Regulating blood flow and maintaining the blood-brain barrier

Accepted Answer

Regulating blood flow and maintaining the blood-brain barrier

Question 12

A person touches a hot stove and immediately feels pain. Which type of sensory receptor is primarily responsible for detecting this stimulus?
Correct answer: Free nerve endings

Accepted Answer

Free nerve endings

Question 13

Which of the following best describes the role of osmoreceptors?
Correct answer: They sense changes in osmotic pressure and are classified as interoceptors.

Accepted Answer

They sense changes in osmotic pressure and are classified as interoceptors.

Question 14

Which of the following body parts is NOT disproportionately represented in the somatosensory cortex?
Correct answer: Gums

Accepted Answer

Gums

Question 15

Cardiac muscle cells can spontaneously generate action potentials without external input. Which specialized cells are responsible for this property?
Correct answer: Pacemaker cells

Accepted Answer

Pacemaker cells

Question 16

A researcher is studying a neuron that requires a much stronger stimulus to fire an action potential than normal. Which phase is the neuron most likely in?
Correct answer: Relative refractory period

Accepted Answer

Relative refractory period

Question 17

Which of the following scenarios best illustrates the function of tonic receptors?
Correct answer: Adapting to a continuous, dim light environment

Accepted Answer

Adapting to a continuous, dim light environment

Question 18

Which of the following statements about the sodium-potassium pump is correct?
Correct answer: It helps maintain the resting membrane potential by pumping sodium out and potassium in.

Accepted Answer

It helps maintain the resting membrane potential by pumping sodium out and potassium in.

Question 19

A person is exposed to a stimulus that causes a small, localized change in membrane potential that decreases with distance from the stimulus site. What type of potential is this?
Correct answer: Graded potential

Accepted Answer

Graded potential

Question 20

Which of the following best explains why the all-or-none principle is important for neural communication?
Correct answer: It allows for consistent and reliable transmission of signals along axons.

Accepted Answer

It allows for consistent and reliable transmission of signals along axons.

Key Concepts in Neurophysiology and Sensory Systems

Study Guide - Practice Questions

Study Guide - Flashcards