Question 1

Which of the following best describes the main function of the Peripheral Nervous System (PNS)?

Accepted Answer

To send information to and carry out actions outside the central nervous system.

Question 2

Which structure is responsible for detecting changes in the environment and initiating sensory pathways in the PNS?

Accepted Answer

Sensory receptors

Question 3

A person accidentally touches a hot stove and quickly withdraws their hand. Which pathway is primarily responsible for this rapid response?

Accepted Answer

Reflex Arcs in the Motor System

Question 4

Which of the following is NOT a component of the afferent division of the PNS?

Accepted Answer

Motor endings

Question 5

If $$N$$ represents the total number of spinal nerves and $$C$$ the number of cranial nerves, which equation correctly expresses the total number of nerves in the PNS?

Accepted Answer

$$N + C$$

Question 6

Which of the following best explains the role of adaptation in sensory receptors?

Accepted Answer

It enables receptors to ignore unchanging stimuli over time.

Question 7

A patient is unable to feel the position of their limbs in space. Which type of receptor is most likely impaired?

Accepted Answer

Proprioceptors

Question 8

Which of the following scenarios involves the efferent division of the PNS?

Accepted Answer

Moving your hand away from a hot surface.

Question 9

Which of the following is classified by modality in the sensory pathway organization?

Accepted Answer

General sensory receptors

Question 10

If the afferent division facilitates the arrival of a signal to the CNS, which term best describes the process by which the efferent division operates?

Accepted Answer

Facilitates the exit of a signal from the CNS

Question 11

Which of the following is a correct sequence for a simple reflex arc in the motor system?

Accepted Answer

Sensory receptor → CNS → Motor neuron → Effector

Question 12

A person is able to sense muscle stretch but cannot initiate a tendon reflex. Which part of the motor system is most likely affected?

Accepted Answer

Tendon reflex pathway

Question 13

Which of the following best describes the difference between cranial nerves and spinal nerves in the PNS?

Accepted Answer

Cranial nerves originate from the brain, while spinal nerves originate from the spinal cord.

Question 14

Which of the following is NOT a function of the peripheral nervous system?

Accepted Answer

Processing information within the brain.

Question 15

If a person has damage to their sensory receptors, which equation best represents the effect on the sensory pathway, where $$S is $$the number of functioning sensory receptors and $$P is $$the probability of detecting a stimulus?

Accepted Answer

$$P \propto S$$

Question 16

Which of the following best explains why adaptation is important for sensory receptors?

Accepted Answer

It prevents the nervous system from being overwhelmed by constant stimuli.

Question 17

A patient is unable to move their hand after touching a hot object, but can still feel the heat. Which division of the PNS is most likely impaired?

Accepted Answer

Efferent division

Question 18

Which of the following is a real-life example of a flexor reflex?

Accepted Answer

Withdrawing your foot after stepping on a sharp object.

Question 19

Which of the following best describes the role of motor endings in the PNS?

Accepted Answer

They transmit signals from the CNS to muscles and glands.

Question 20

If $$A is $$the number of afferent signals and $$E is $$the number of efferent signals, which equation represents the total number of signals processed by the PNS?

Accepted Answer

$$A + E$$

Peripheral Nervous System: Structure and Function

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