Question 1

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

Accepted Answer

The conversion of a physical stimulus into a change in membrane potential

Question 2

A patient is unable to distinguish between two closely spaced points on their back, but can easily do so on their fingertips. Which of the following best explains this phenomenon?

Accepted Answer

The receptive fields on the back are larger and have more convergence than those on the fingertips

Question 3

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

Accepted Answer

Chemoreceptors

Question 4

A person places their hand on a hot stove and immediately withdraws it before consciously feeling pain. Which neural pathway is primarily responsible for this response?

Accepted Answer

Reflexive pathway integrated in the spinal cord

Question 5

Which of the following best describes the labeled line coding principle?

Accepted Answer

Each sensory receptor is associated with a specific sensory modality and projects to a specific region in the brain

Question 6

A patient with chronic pain after a nerve injury is experiencing pain without an obvious stimulus. Which term best describes this condition?

Accepted Answer

Neuropathic (chronic) pain

Question 7

Which of the following is TRUE regarding tonic and phasic receptors?

Accepted Answer

Tonic receptors maintain a sustained response to a constant stimulus, while phasic receptors respond only to changes in stimulus

Question 8

Which of the following best explains why lateral inhibition enhances the localization of a stimulus on the skin?

Accepted Answer

It inhibits neighboring neurons, sharpening the contrast between the stimulus and surrounding areas

Question 9

A patient reports a sharp, localized pain immediately after stepping on a tack, followed by a dull, aching pain. Which fibers are responsible for each sensation?

Accepted Answer

A\delta fibers for sharp pain; C fibers for dull pain

Question 10

Which of the following equations best represents the relationship between stimulus intensity and action potential frequency in a sensory neuron?

Accepted Answer

$$f = k \cdot I$$

Question 11

A patient experiences pain in the left arm during a heart attack. This is an example of:

Accepted Answer

Referred pain due to convergence of visceral and somatic sensory pathways

Question 12

Which of the following best describes the function of Pacinian corpuscles?

Accepted Answer

Detecting vibration and deep pressure

Question 13

Which of the following statements about the two-point discrimination test is correct?

Accepted Answer

It assesses the size and density of receptive fields in a given area of skin

Question 14

Which of the following best explains the gate control theory of pain modulation?

Accepted Answer

Non-painful input closes the 'gates' to painful input, reducing pain perception

Question 15

Which of the following is a correct sequence for the pathway of somatic sensation from the skin to the brain?

Accepted Answer

Primary sensory neuron → secondary sensory neuron → tertiary sensory neuron → somatosensory cortex

Question 16

Which of the following best describes the role of TRP channels in thermoreception?

Accepted Answer

They are cation channels that respond to varying degrees of heat

Question 17

A researcher is studying the adaptation of sensory receptors. Which of the following would be observed in a phasic receptor exposed to a constant stimulus?

Accepted Answer

The receptor initially fires action potentials, then stops responding despite the continued stimulus

Question 18

Which of the following best describes population coding in sensory systems?

Accepted Answer

The intensity of a stimulus is encoded by the number of receptors activated

Question 19

Which of the following is NOT a function of mechanoreceptors?

Accepted Answer

Detecting photons of light

Question 20

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

Accepted Answer

Impaired conscious perception of touch, pain, and temperature

General Properties of Sensory Systems and Somatic Senses

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