Question 1

Which of the following best describes the difference between gray matter and white matter in the central nervous system?

Accepted Answer

Gray matter contains neuron cell bodies, dendrites, and unmyelinated axons, while white matter is composed primarily of myelinated axons.

Question 2

A patient suffers a stroke that damages the precentral gyrus of the frontal lobe. Which function is most likely to be impaired?

Accepted Answer

Voluntary motor control

Question 3

Which equation correctly represents the calculation of membrane potential using the Nernst equation for potassium ions ($K^+$)?

Accepted Answer

$E_K = \frac{RT}{zF} \ln \left( \frac{[K^+]_{out}}{[K^+]_{in}} \right)$

Question 4

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

Accepted Answer

It is formed by astrocytes and tight junctions between endothelial cells.

Question 5

A patient is unable to distinguish between coarse touch and fine touch on their skin. Which sensory receptor is most likely damaged?

Accepted Answer

Meissner's corpuscle

Question 6

Which of the following best explains the effect of lateral inhibition in sensory physiology?

Accepted Answer

It enhances contrast and sharpens the perception of a stimulus by inhibiting neighboring neurons.

Question 7

Which neurotransmitter is released at the neuromuscular junction to initiate muscle contraction?

Accepted Answer

Acetylcholine

Question 8

A patient presents with muscle weakness and fatigue. Laboratory tests reveal a deficiency in acetylcholine receptors at the neuromuscular junction. Which disorder is most likely?

Accepted Answer

Myasthenia gravis

Question 9

Which of the following is a correct sequence of events in the Excitation-Contraction Coupling pathway in skeletal muscle?

Accepted Answer

Action potential → release of calcium from sarcoplasmic reticulum → cross-bridge formation → muscle contraction

Question 10

Which of the following best describes the role of the sympathetic branch of the autonomic nervous system?

Accepted Answer

It prepares the body for 'fight or flight' by increasing heart rate, dilating pupils, and inhibiting digestion.

Question 11

Which of the following equations correctly represents the calculation of cardiac output ($CO$)?

Accepted Answer

$CO = HR 	imes SV$

Question 12

A patient is unable to feel pain from a pinprick but can sense temperature changes. Which type of sensory fiber is most likely damaged?

Accepted Answer

A-delta fiber

Question 13

Which of the following is TRUE regarding the organization of the cerebral cortex?

Accepted Answer

The parietal lobe processes somatosensory information.

Question 14

Which of the following best describes the difference between slow-twitch and fast-twitch muscle fibers?

Accepted Answer

Slow-twitch fibers are more resistant to fatigue and are used for endurance activities.

Question 15

Which of the following is a function of the thalamus?

Accepted Answer

Relay of sensory information to the cerebral cortex

Question 16

A patient is unable to distinguish between sweet and salty tastes. Which type of receptor is most likely malfunctioning?

Accepted Answer

Chemoreceptor

Question 17

Which of the following best describes the function of satellite cells in skeletal muscle?

Accepted Answer

They repair and regenerate damaged muscle tissue.

Question 18

Which of the following is TRUE regarding the difference between tonic and phasic receptors?

Accepted Answer

Tonic receptors provide information about the duration of a stimulus, while phasic receptors signal changes in stimulus intensity.

Question 19

Which of the following best explains the effect of antagonistic control in the autonomic nervous system?

Accepted Answer

Sympathetic and parasympathetic branches produce opposite effects on target organs.

Anatomy & Physiology Study Guide: Central Nervous System, Sensory Physiology, Efferent Division, and Muscles

Study Guide - Practice Questions

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