Question 1

Which type of sensory receptor is most likely to detect pain and temperature in the skin?

Accepted Answer

Neuron with free nerve endings

Question 2

What is the primary function of the dorsal root of a spinal nerve?

Accepted Answer

To transmit sensory information from the PNS to the CNS

Question 3

Which of the following best describes the process of perception?

Accepted Answer

Conscious awareness of a sensation

Question 4

A patient loses the ability to perceive touch on the right side of their body. Which region of the brain is most likely damaged?

Accepted Answer

Left primary somatosensory cortex

Question 5

Which equation best represents the propagation of an action potential along a neuron?

Accepted Answer

$$ \frac{dV}{dt} = \frac{I}{C} $$

Question 6

Which sensory receptor is responsible for detecting chemical stimuli such as odorants and taste molecules?

Accepted Answer

Chemoreceptor

Question 7

In the ascending sensory pathway, how many consecutive neurons are involved in transmitting information to the brain?

Accepted Answer

Three

Question 8

Which tract is primarily responsible for transmitting motor information from the brain to the spinal cord?

Accepted Answer

Corticospinal tract

Question 9

Which of the following best explains why the sensory homunculus depicts the hands and lips as larger than the trunk?

Accepted Answer

The hands and lips have more sensitive sensory receptors

Question 10

Which pathway would be most affected by a lesion in the medullary pyramids?

Accepted Answer

Corticospinal tract

Question 11

If a patient has lost proprioception in their left leg, which side of the brain is most likely affected?

Accepted Answer

Right side

Question 12

Which of the following is true about the anterior corticospinal tract?

Accepted Answer

Some fibers are ipsilateral and do not decussate

Question 13

Which of the following is a real-life example of sensation without perception?

Accepted Answer

Detecting changes in blood pressure subconsciously

Question 14

Which equation would you use to calculate the membrane potential change during an action potential?

Accepted Answer

$$ \Delta V = V_{final} - V_{initial} $$

Question 15

Which of the following best describes the function of the ventral root of a spinal nerve?

Accepted Answer

Transmits motor information to the PNS

Question 16

Which of the following is NOT a function of mechanoreceptors?

Accepted Answer

Detecting light

Question 17

Which of the following best explains why most motor fibers decussate at the pyramidal decussation?

Accepted Answer

To allow the left side of the brain to control the right side of the body

Question 18

Which of the following is a specialized receptor cell found in the retina?

Accepted Answer

Rod

Question 19

Which pathway is responsible for transmitting pain and temperature sensations?

Accepted Answer

Spinothalamic tract

Question 20

Which of the following best describes the relationship between sensation and perception?

Accepted Answer

Sensation is the activation of sensory receptor cells, while perception is conscious awareness of the sensation

Chapter 14: The Somatic Nervous System – Sensory and Motor Pathways

Study Guide - Practice Questions