Question 1

Which of the following best describes the difference between afferent and efferent neurons in the nervous system?

Accepted Answer

Afferent neurons carry sensory information toward the CNS, while efferent neurons carry motor commands away from the CNS.

Question 2

A patient presents with paralysis on the right side of the body following a stroke. Based on your knowledge of brain anatomy and neural pathways, where is the most likely location of the brain damage?

Accepted Answer

Left cerebral hemisphere due to contralateral decussation of motor pathways.

Question 3

Which glial cell is responsible for forming the myelin sheath in the central nervous system (CNS), and how does this differ from myelination in the peripheral nervous system (PNS)?

Accepted Answer

Oligodendrocytes form myelin in the CNS; Schwann cells form myelin in the PNS.

Question 4

Which of the following best explains why myelinated axons conduct action potentials faster than unmyelinated axons?

Accepted Answer

Myelin allows for saltatory conduction, where action potentials jump between nodes of Ranvier.

Question 5

Which of the following is NOT a function of the hypothalamus?

Accepted Answer

Initiation of voluntary motor movements.

Question 6

A patient is unable to understand spoken language but can speak fluently, although their speech may not make sense. Damage to which area of the brain is most likely responsible?

Accepted Answer

Wernicke's area in the left temporal/parietal lobe.

Question 7

Which of the following best describes the function of the arachnoid villi in the meninges?

Accepted Answer

They reabsorb CSF into the venous circulation.

Question 8

Which of the following is the correct order of the neural pathway for a visual impulse from the retina to the brain?

Accepted Answer

Retina → Optic nerve → Optic chiasm → Optic tract → Thalamus → Visual cortex

Question 9

Which of the following equations correctly represents the relationship between the speed of action potential conduction ($$v$$), axon diameter ($$d$$), and myelination?

Accepted Answer

$$v \propto \sqrt{d}$$ for unmyelinated axons; $$v \propto d$$ for myelinated axons.

Question 10

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 and is superficial in the brain; white matter contains myelinated axons and is deep in the brain.

Question 11

A patient complains of muscle weakness on the left side of the body, but all sensations are normal. Which spinal root is most likely affected, and on which side?

Accepted Answer

Ventral root on the left side.

Question 12

Which of the following best describes the function of the circle of Willis?

Accepted Answer

It provides a redundant blood supply to the brain, ensuring continuous perfusion even if one artery is blocked.

Question 13

Which of the following is a correct pairing of receptor type and stimulus?

Accepted Answer

Pacinian corpuscles – vibration

Question 14

Which of the following statements about the autonomic nervous system (ANS) is correct?

Accepted Answer

Sympathetic preganglionic fibers are short and release acetylcholine; parasympathetic preganglionic fibers are long and release acetylcholine.

Question 15

Which of the following best describes the function of the cerebellum?

Accepted Answer

Coordinates and fine-tunes voluntary movements and maintains posture and balance.

Question 16

Which of the following is a correct sequence of the five components of a reflex arc?

Accepted Answer

Receptor → Sensory neuron → Integration center → Motor neuron → Effector

Question 17

Which of the following best explains why a slipped intervertebral disc causing loss of sensation but not motor function on the right side of the body is most likely affecting the dorsal root on the right?

Accepted Answer

The dorsal root contains sensory neurons entering the spinal cord, so damage here impairs sensation but not movement.

Question 18

Which of the following best describes the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream; exocrine glands secrete substances into ducts.

Question 19

Which of the following is a function of the limbic system?

Accepted Answer

Regulation of emotional responses and memory formation.

Comprehensive Study Guide: Nervous System, Special Senses, and Endocrine System

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