Q: Which equation best describes the relationship between sound intensity ($$I) $$and loudness in decibels ($$L$$)?

$$L = 10 \times \log_{10} \left( \frac{I}{I_0$} \right)$$

Question 1

Which type of sensory receptor is primarily responsible for detecting changes in blood pH and oxygen levels, and what is the physiological significance of this detection?

Accepted Answer

Chemoreceptors; they help regulate respiratory rate by sensing chemical changes in the blood.

Question 2

A patient presents with loss of sensation in a small, well-defined area of the fingertip. Which property of sensory neurons explains this high sensitivity?

Accepted Answer

Small receptive fields and minimal convergence.

Question 3

Which equation best describes the relationship between stimulus intensity and action potential frequency in sensory neurons?

Accepted Answer

$$f = k 	imes I$$

Question 4

During a two-point discrimination test, why are the lips more sensitive than the back?

Accepted Answer

The lips have smaller receptive fields and less convergence.

Question 5

Which process allows the nervous system to decrease its response to a constant, non-threatening stimulus, such as wearing a watch?

Accepted Answer

Habituation

Question 6

A patient with sensorineural hearing loss is most likely to have damage in which part of the auditory system?

Accepted Answer

Cochlear hair cells

Question 7

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

Accepted Answer

Convergence of visceral and somatic pain pathways onto the same ascending tract.

Question 8

Which neurotransmitter is released by Type III presynaptic cells in response to sour taste, and what is its effect?

Accepted Answer

Serotonin; activates primary sensory neurons.

Question 9

Which structure in the vestibular apparatus is responsible for sensing rotational acceleration of the head?

Accepted Answer

Semicircular canals

Question 10

A person is unable to focus on near objects due to loss of lens elasticity. What is the name of this condition?

Accepted Answer

Presbyopia

Question 11

Which of the following best describes the function of lateral inhibition in sensory pathways?

Accepted Answer

It sharpens the perception of stimulus location by inhibiting neighboring neurons.

Question 12

Which type of receptor adaptation allows you to remain aware of a stimulus, such as pain, over a long period?

Accepted Answer

Tonic adaptation

Question 13

Which equation represents the calculation of focal length ($$f) $$for a lens with refractive power ($$P) in $$diopters?

Accepted Answer

$$f = \frac{1}{P}$$

Question 14

Which cells in the retina are responsible for the most acute vision, and where are they located?

Accepted Answer

Cones; fovea and macula

Question 15

A patient is unable to perceive sweet and umami tastes. Which receptor type and signaling molecule are most likely affected?

Accepted Answer

Type II receptor cells and gustducin

Question 16

Which of the following drugs acts by inhibiting prostaglandin synthesis, thereby reducing pain and inflammation?

Accepted Answer

Aspirin

Question 17

Which equation best describes the relationship between sound intensity ($$I) $$and loudness in decibels ($$L$$)?

Accepted Answer

$$L = 10 	imes \log_{10} \left( \frac{I}{I_0$} ight)$$

Question 18

Which sensory pathway projects directly to the amygdala and hypothalamus, explaining the strong link between memory, emotion, and this sense?

Accepted Answer

Olfactory pathway

Question 19

Which structure in the eye is responsible for modulating the quantity of light entering and the depth of field?

Accepted Answer

Pupil

Question 20

A patient experiences sharp, localized pain immediately after touching a hot surface, followed by a dull, diffuse pain. Which fibers are responsible for each sensation?

Accepted Answer

Sharp pain: AB fibers; Dull pain: C fibers

Sensory Physiology: General Properties and Sensory Receptors

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