Q: Which of the following equations correctly represents the process of sensory transduction in a neuron?

$$\text{Stimulus} \rightarrow \text{Mechanically gated Na^+ channels open} \rightarrow \text{Na^+ influx} \rightarrow \text{Depolarization (receptor potential)}$$

Question 1

Which of the following best describes the primary function of the peripheral nervous system (PNS)?

Accepted Answer

To link the central nervous system (CNS) to the external and internal environment by detecting sensory stimuli and delivering information to the CNS.

Question 2

The sensory (afferent) division of the PNS is responsible for which of the following?

Accepted Answer

Detecting and transmitting sensory stimuli to the CNS.

Question 3

Which anatomical subdivision of the sensory division detects both internal and external stimuli and includes general sense receptors?

Accepted Answer

Somatic sensory division

Question 4

A patient presents with loss of sensation in the skin and muscles of the forearm. Which division of the PNS is most likely affected?

Accepted Answer

Somatic sensory division

Question 5

Which of the following is TRUE regarding the visceral sensory division?

Accepted Answer

It relays internal information such as stretch and pressure from organs of the abdominopelvic and thoracic cavities.

Question 6

If the autonomic motor division of the PNS is damaged, which of the following functions would most likely be impaired?

Accepted Answer

Regulation of heart rate and digestion

Question 7

Which division of the PNS is responsible for the 'fight or flight' response?

Accepted Answer

Sympathetic nervous system

Question 8

The parasympathetic nervous system is primarily involved in which of the following?

Accepted Answer

Maintaining homeostasis at rest and promoting digestion

Question 9

Which of the following best explains the difference between the somatic and autonomic motor divisions of the PNS?

Accepted Answer

The somatic motor division controls voluntary movements of skeletal muscles, while the autonomic motor division regulates involuntary functions such as heart rate and gland secretion.

Question 10

Which of the following equations correctly represents the process of sensory transduction in a neuron?

Accepted Answer

$$	ext{Stimulus} ightarrow 	ext{Mechanically gated Na^+ channels open} ightarrow 	ext{Na^+ influx} ightarrow 	ext{Depolarization (receptor potential)}$$

Question 11

A rapidly adapting receptor responds to a stimulus by:

Accepted Answer

Sending signals only at the initiation of the stimulus and then ignoring ongoing stimulation.

Question 12

Which type of sensory receptor is primarily responsible for detecting changes in temperature?

Accepted Answer

Thermoreceptors

Question 13

Which of the following best describes the role of proprioceptors?

Accepted Answer

Providing information about body position and movement

Question 14

A patient is unable to discriminate between different textures when touching objects. Which mechanoreceptor is most likely damaged?

Accepted Answer

Merkel cell nerve endings

Question 15

Which of the following cranial nerves is purely sensory and responsible for the sense of smell?

Accepted Answer

Olfactory nerve (CN I)

Question 16

Which cranial nerve is responsible for transmitting visual information from the retina to the brain?

Accepted Answer

Optic nerve (CN II)

Question 17

Which of the following best describes the function of the oculomotor nerve (CN III)?

Accepted Answer

Innervates most of the extrinsic muscles of the eye and controls pupil constriction.

Question 18

Which equation best represents the relationship between axon diameter, myelin thickness, and conduction velocity in peripheral neurons?

Accepted Answer

$$	ext{Conduction velocity} \propto 	ext{Axon diameter} 	imes 	ext{Myelin thickness}$$

Question 19

Which of the following is a correct sequence for a simple stretch reflex arc?

Accepted Answer

Sensory receptor \rightarrow Sensory neuron \rightarrow Motor neuron \rightarrow Effector

The Peripheral Nervous System: Structure and Function

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