Question 1

Which of the following best describes the difference between sensation and perception in sensory processing?

Accepted Answer

Sensation is the awareness of changes in the environment, while perception is the conscious interpretation of those stimuli.

Question 2

A patient presents with loss of pain and temperature sensation in their left arm. Which type of sensory receptor is most likely affected?

Accepted Answer

Nociceptors

Question 3

Which connective tissue covering surrounds individual axons and their myelin sheaths within a nerve?

Accepted Answer

Endoneurium

Question 4

Which cranial nerve is responsible for the majority of parasympathetic output to the thoracic and abdominal organs?

Accepted Answer

Vagus nerve (X)

Question 5

A person suffers a spinal injury that damages the ventral rami of the lumbar plexus. Which of the following is a likely consequence?

Accepted Answer

Impaired movement and sensation in the anterior and medial thigh

Question 6

Which of the following best describes the function of proprioceptors?

Accepted Answer

They inform the brain of body position and movement by responding to stretch in muscles and tendons.

Question 7

Which of the following equations correctly represents the relationship between the number of spinal nerves and their regions?

Accepted Answer

$$8 + 12 + 5 + 5 + 1 = 31$$

Question 8

Which of the following is NOT a function of the autonomic nervous system (ANS)?

Accepted Answer

Voluntary control of skeletal muscles

Question 9

A patient has difficulty breathing due to damage to a nerve originating from the cervical plexus. Which nerve is most likely affected?

Accepted Answer

Phrenic nerve

Question 10

Which of the following best describes the crossed-extensor reflex?

Accepted Answer

It involves the withdrawal of a limb from a painful stimulus while the opposite limb extends to support the body.

Question 11

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

Accepted Answer

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

Question 12

Which of the following statements about nerve plexuses is TRUE?

Accepted Answer

Only ventral rami form plexuses, which allow each limb muscle to be innervated by more than one spinal nerve.

Question 13

Which of the following cranial nerves is purely sensory?

Accepted Answer

Olfactory nerve (I)

Question 14

A person is unable to taste or smell. Which types of sensory receptors are most likely impaired?

Accepted Answer

Chemoreceptors

Question 15

Which of the following best describes the function of the sciatic nerve?

Accepted Answer

It innervates the hamstring muscles, adductor magnus, and most muscles in the leg and foot.

Question 16

Which of the following is a correct statement about the structural organization of the nervous system?

Accepted Answer

The peripheral nervous system (PNS) includes both sensory (afferent) and motor (efferent) divisions.

Question 17

Which of the following best describes the role of baroreceptors?

Accepted Answer

They detect pressure changes within body structures such as blood vessels.

Question 18

Which equation best represents the relationship between the number of cervical, thoracic, lumbar, sacral, and coccygeal spinal nerves?

Accepted Answer

$$C_8 + T$$_{12} + $$L_5$$ + $$S_5$$ + $$Co_1 = 31$

Ch. 13 The Peripheral Nervous System and Reflex Activity: Structure, Function, and Organization

Study Guide - Practice Questions