Question 1

Which of the following best describes the process of sensory transduction in a mechanoreceptor?

Accepted Answer

Conversion of a mechanical stimulus into an electrical signal via the influx of $$\mathrm{Na^+}$$ ions, leading to a receptor potential.

Question 2

A patient is unable to distinguish between two points applied 3 mm apart on their fingertip, but can distinguish two points 40 mm apart on their forearm. What does this indicate about the density and receptive field size of sensory neurons in these areas?

Accepted Answer

The fingertip has a higher density of sensory neurons with smaller receptive fields than the forearm.

Question 3

Which mechanoreceptor is responsible for detecting vibration and deep pressure in the skin?

Accepted Answer

Lamellated (Pacinian) corpuscle

Question 4

What is the correct sequence of events for the generation of an action potential in a somatic sensory neuron following a mechanical stimulus?

Accepted Answer

Mechanical stimulus → Influx of $$\mathrm{Na^+}$$ ions → Receptor potential → Threshold reached → Action potential

Question 5

Which of the following best explains why pain from a heart attack is sometimes felt in the left arm?

Accepted Answer

Visceral sensory neurons from the heart and somatic sensory neurons from the left arm converge on the same spinal cord segments, leading to referred pain.

Question 6

Which of the following statements about adaptation in sensory receptors is correct?

Accepted Answer

Rapidly adapting receptors stop firing action potentials even if the stimulus remains, allowing the body to ignore unimportant stimuli.

Question 7

A patient has damage to the dorsal column of their spinal cord. Which sensory function is most likely to be impaired?

Accepted Answer

Detection of vibration and fine touch

Question 8

Which of the following best describes the role of the hypothalamus in homeostasis?

Accepted Answer

It integrates sensory information and coordinates autonomic responses to maintain variables such as body temperature and fluid balance.

Question 9

Which of the following equations correctly represents the relationship between cardiac output ($$CO$$), heart rate ($$HR$$), and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 10

A person is exposed to a hot environment, causing their body temperature to rise above the set point. Which of the following is the correct sequence of events in the negative feedback loop that returns body temperature to normal?

Accepted Answer

Stimulus → Receptor → Control Center → Effector/Response

Question 11

Which of the following best describes the function of proprioceptors?

Accepted Answer

They sense movement and position of joints and muscles, contributing to the kinesthetic sense.

Question 12

Which of the following is true regarding the conduction speed of sensory neurons?

Accepted Answer

Neurons with larger diameters and more myelination conduct signals more quickly.

Question 13

Which of the following best explains why the primary motor cortex is needed for voluntary control of defecation and micturition?

Accepted Answer

It sends signals to skeletal muscles, allowing conscious control over the external sphincters.

Question 14

Which of the following is a function of the visceral sensory division of the peripheral nervous system?

Accepted Answer

Carrying signals from organs to the central nervous system.

Question 15

A patient with a lesion in the somatosensory cortex would most likely experience which of the following symptoms?

Accepted Answer

Loss of conscious perception of touch, pain, and temperature.

Question 16

Which of the following best describes the function of dermatomes?

Accepted Answer

They are regions of the skin supplied by a single spinal nerve, useful for mapping sensory pathways.

Question 17

Which of the following is the correct pathway for a somatic sensory signal from the skin to the brain?

Accepted Answer

Skin → Sensory neuron → Spinal cord → Thalamus → Somatosensory cortex

Question 18

Which of the following best explains the difference between sensation and perception?

Accepted Answer

Sensation is the detection of a stimulus by sensory receptors, while perception is the conscious interpretation of that stimulus by the brain.

Sensation, Perception, and Sensory Transduction in Anatomy & Physiology

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