Question 1

Which of the following best describes the process of sensory transduction in sensory physiology?

Accepted Answer

Conversion of stimulus energy into graded potentials in sensory receptors

Question 2

A patient is unable to distinguish between hot and cold objects. Which type of sensory receptor is most likely impaired?

Accepted Answer

Thermoreceptors

Question 3

Which equation best represents the relationship between stimulus intensity and frequency of action potentials in a sensory neuron?

Accepted Answer

$$f = k 	imes I$$

Question 4

Lateral inhibition in sensory pathways enhances which aspect of sensory perception?

Accepted Answer

Contrast and localization of stimulus

Question 5

Which of the following is TRUE regarding receptive fields of sensory neurons?

Accepted Answer

Smaller receptive fields allow for more precise localization of stimuli

Question 6

A person touches a hot stove and immediately withdraws their hand. Which type of nerve fiber is primarily responsible for the fast pain response?

Accepted Answer

Aδ fibers

Question 7

Which of the following best explains referred pain, such as pain from a heart attack felt in the left arm?

Accepted Answer

Sensory neurons from the heart and arm converge on the same spinal pathway

Question 8

Which sensory receptor type is responsible for detecting changes in blood pH?

Accepted Answer

Chemoreceptors

Question 9

Which of the following mechanisms is involved in the gate control theory of pain modulation?

Accepted Answer

Activation of inhibitory interneurons by Aβ fibers

Question 10

Which equation describes the graded potential ($$V_{GP}) $$generated by a sensory receptor in response to a stimulus of intensity $$I$$ and receptor sensitivity $$S$$?

Accepted Answer

$$V_{GP} = S 	imes I$$

Question 11

Which of the following is a property of phasic sensory receptors?

Accepted Answer

They adapt rapidly and stop firing if the stimulus remains constant

Question 12

Which pathway correctly describes the flow of somatosensory information from the skin to the brain?

Accepted Answer

Skin → Spinal cord → Thalamus → Somatosensory cortex

Question 13

Which of the following best describes the function of mechanoreceptors in the skin?

Accepted Answer

Detect physical deformation such as pressure and vibration

Question 14

Which of the following is NOT a basic taste sensation detected by the human gustatory system?

Accepted Answer

Spicy

Question 15

A patient has damage to the thalamus. Which sensory function is most likely to be affected?

Accepted Answer

Transmission of somatosensory information to the cortex

Question 16

Which of the following best explains why lateral inhibition improves two-point discrimination in the skin?

Accepted Answer

It suppresses signals from neighboring neurons, sharpening contrast

Question 17

Which class of somatosensory nerve fibers is responsible for transmitting slow, dull pain?

Accepted Answer

C fibers

Question 18

Which of the following is a function of the olfactory epithelium?

Accepted Answer

Detection of airborne chemicals and initiation of olfactory signals

Question 19

Which of the following statements about nociceptors is correct?

Accepted Answer

Nociceptors respond to stimuli that may damage tissue

Question 20

Which equation best represents the threshold for action potential generation ($$V_{th}) in a $$sensory neuron, given a graded potential ($$V_{GP}) $$and a threshold value ($$T$$)?

Accepted Answer

$$V_{GP} \geq T \implies$$ action potential generated

Sensory Physiology: Principles and Mechanisms

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