Q: Which equation best represents the process of sensory transduction in a neuron?

$$\text{Stimulus} \rightarrow \text{Ion channel opens} \rightarrow \text{Depolarization} \rightarrow \text{Action potential}$$

Question 1

Which of the following best describes the function of the somatic motor division of the peripheral nervous system (PNS)?

Accepted Answer

It is responsible for voluntary motor functions and is composed of lower motor neurons that directly trigger skeletal muscle contractions.

Question 2

A patient suffers damage to the phrenic nerve. Which physiological function is most likely to be impaired?

Accepted Answer

Movement of the diaphragm and breathing

Question 3

Which equation best represents the process of sensory transduction in a neuron?

Accepted Answer

$$	ext{Stimulus} ightarrow 	ext{Ion channel opens} ightarrow 	ext{Depolarization} ightarrow 	ext{Action potential}$$

Question 4

A person is unable to feel pain or temperature on the lateral aspect of their forearm. Which nerve is most likely damaged?

Accepted Answer

Musculocutaneous nerve

Question 5

Which of the following best describes the function of the endoneurium in a peripheral nerve?

Accepted Answer

It surrounds each individual axon within a fascicle.

Question 6

A patient presents with loss of voluntary movement in the right leg but retains sensation. Which division of the spinal nerve is most likely affected?

Accepted Answer

Anterior root

Question 7

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

Accepted Answer

Optic nerve (CN II)

Question 8

A person is unable to abduct their arm at the shoulder and has numbness over the deltoid region. Which nerve is most likely injured?

Accepted Answer

Axillary nerve

Question 9

Which of the following best describes the role of the autonomic nervous system (ANS)?

Accepted Answer

It maintains many aspects of homeostasis by controlling involuntary motor functions in the body.

Question 10

Which of the following is a rapidly adapting sensory receptor?

Accepted Answer

Tactile (Meissner) corpuscle

Question 11

A patient has difficulty extending their wrist and fingers and has numbness on the posterior aspect of the forearm. Which nerve is most likely affected?

Accepted Answer

Radial nerve

Question 12

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

Accepted Answer

It surrounds each fascicle (bundle) of axons within a nerve.

Question 13

Which of the following equations best represents the relationship between the number of spinal nerves and vertebral levels?

Accepted Answer

$$N_{spinal} = N_{cervical} + N_{thoracic} + N_{lumbar} + N_{sacral} + N_{coccygeal}$$

Question 14

A patient is unable to dorsiflex their foot and has numbness over the lateral aspect of the leg and dorsum of the foot. Which nerve is most likely damaged?

Accepted Answer

Common fibular (peroneal) nerve

Question 15

Which of the following best describes the function of exteroceptors?

Accepted Answer

They detect stimuli originating from outside the body, such as touch, temperature, and pain.

Question 16

A patient presents with loss of sensation in the anterior thigh and medial leg. Which nerve is most likely affected?

Accepted Answer

Femoral nerve

Question 17

Which of the following best describes a monosynaptic reflex arc?

Accepted Answer

It involves only a sensory neuron and a motor neuron with a single synapse between them.

Question 18

Which of the following is a function of the visceral sensory division?

Accepted Answer

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

Question 19

A patient is unable to adduct their thigh and has numbness over the medial aspect of the thigh. Which nerve is most likely damaged?

Accepted Answer

Obturator nerve

Question 20

Which of the following best describes the function of the posterior (dorsal) root of a spinal nerve?

Accepted Answer

It contains sensory neurons that transmit information to the CNS.

Peripheral Nervous System: Structure, Function, and Sensation

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