Question 1

Which of the following best describes the primary function of the myelin sheath in the nervous system?

Accepted Answer

It increases the speed of action potential propagation along the axon by insulating the nerve fiber.

Question 2

A patient is unable to distinguish between hot and cold objects when touching them. Which type of sensory receptor is most likely malfunctioning?

Accepted Answer

Thermoreceptors

Question 3

Which of the following best explains the difference between graded potentials and action potentials?

Accepted Answer

Graded potentials can vary in amplitude and decay with distance, while action potentials are all-or-nothing and propagate without decrement.

Question 4

During the repolarization phase of an action potential, which ion movement is primarily responsible for restoring the resting membrane potential?

Accepted Answer

Potassium ions ($$K^+) $$move out of the neuron.

Question 5

A person suffers a stroke that damages the occipital lobe of the brain. Which function is most likely to be impaired?

Accepted Answer

Vision

Question 6

Which of the following best describes the function of the hypothalamus in the endocrine system?

Accepted Answer

It links the nervous and endocrine systems by regulating the pituitary gland through releasing and inhibiting hormones.

Question 7

A patient presents with excessive thirst and urination. Laboratory tests reveal low levels of antidiuretic hormone (ADH). Which gland is most likely malfunctioning?

Accepted Answer

Posterior pituitary gland

Question 8

Which of the following is a correct sequence of the elements in a typical reflex arc?

Accepted Answer

Receptor $$\rightarrow$$ sensory neuron $$\rightarrow$$ integration center $$\rightarrow$$ motor neuron $$\rightarrow$$ effector

Question 9

Which of the following best describes the function of the lens in the eye?

Accepted Answer

It changes shape to focus light on the retina for clear vision at different distances.

Question 10

A person is unable to maintain balance when standing still but can walk without difficulty. Which part of the inner ear is most likely affected?

Accepted Answer

The vestibule (utricle and saccule), which detects static equilibrium.

Question 11

Which hormone is produced by the adrenal medulla and is responsible for the 'fight-or-flight' response?

Accepted Answer

Epinephrine (adrenaline)

Question 12

Which of the following best describes the role of the sodium-potassium pump ($$Na^+/K^+$$ ATPase) in maintaining the resting membrane potential?

Accepted Answer

It actively transports 3 $$Na^+$$ ions out of the cell and 2 $$K^+$$ ions into the cell, maintaining a negative charge inside the neuron.

Question 13

A patient has difficulty distinguishing sweet and salty tastes but can still detect sour and bitter. Which cranial nerve is most likely affected?

Accepted Answer

Facial nerve (Cranial Nerve VII)

Question 14

Which of the following best explains why damage to the left primary motor cortex results in paralysis on the right side of the body?

Accepted Answer

Motor pathways decussate (cross over) in the medulla oblongata, so each hemisphere controls the opposite side.

Question 15

Which of the following is a function of astrocytes in the central nervous system?

Accepted Answer

They help form the blood-brain barrier and regulate the extracellular environment.

Question 16

A person is exposed to a loud sound and experiences a reflexive blinking of the eyes. Which type of reflex is this, and what is its significance?

Accepted Answer

It is a protective somatic reflex that helps shield the eyes from potential harm.

Question 17

Which of the following best describes the function of the semicircular canals in the inner ear?

Accepted Answer

They detect rotational (dynamic) movements of the head.

Question 18

Which hormone is detected by over-the-counter pregnancy tests, and what is its primary function during pregnancy?

Accepted Answer

Human chorionic gonadotropin ($$hCG$$); it maintains the corpus luteum to support early pregnancy.

Question 19

A patient with damage to the Broca's area of the brain would most likely experience which of the following symptoms?

Accepted Answer

Difficulty producing speech (expressive aphasia)

Question 20

Which of the following best describes the difference between the sympathetic and parasympathetic divisions of the autonomic nervous system?

Accepted Answer

The sympathetic division prepares the body for 'fight-or-flight' responses, while the parasympathetic division promotes 'rest-and-digest' activities.

Anatomy & Physiology: Nervous, Sensory, and Endocrine Systems Study Guide

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