Q: Which equation represents the conversion of cis-retinal to trans-retinal during photopigment bleaching?

$$\text{cis-retinal} \xrightarrow{\text{light}} \text{trans-retinal}$$

Q: Which equation describes the depolarization of hair cells in the cochlea due to K+ influx?

$$\text{K}^+_{\text{endolymph}} \rightarrow \text{hair cell}$$

Question 1

Which structure is responsible for the 'blind spot' in the human eye, and why does this occur?

Accepted Answer

Optic disc, because it lacks photoreceptors.

Question 2

During accommodation for near vision, which sequence of events occurs in the ciliary body and lens?

Accepted Answer

Ciliary muscle contracts, ciliary zonule loosens, lens bulges.

Question 3

Which equation best describes the relationship between the focal length ($$f$$), object distance ($$d_o$$), and image distance ($$d_i) in $$the eye's lens system?

Accepted Answer

$$\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}$$

Question 4

A patient presents with blurry vision for distant objects but can see nearby objects clearly. Which condition is most likely, and what is the anatomical cause?

Accepted Answer

Myopia; eyeball is too long.

Question 5

Which photoreceptor type is most abundant in the peripheral retina and is responsible for vision in dim light?

Accepted Answer

Rods

Question 6

What is the primary function of the pigmented layer of the retina?

Accepted Answer

To absorb light and prevent it from scattering within the eye.

Question 7

Which neurotransmitter is released by photoreceptor cells in the dark, and what happens to its release when exposed to light?

Accepted Answer

Glutamate; release decreases when exposed to light.

Question 8

Which equation represents the conversion of cis-retinal to trans-retinal during photopigment bleaching?

Accepted Answer

$$	ext{cis-retinal} \xrightarrow{	ext{light}} 	ext{trans-retinal}$$

Question 9

Which cranial nerve is responsible for transmitting visual information from the retina to the brain?

Accepted Answer

CN II (optic nerve)

Question 10

In the process of olfactory transduction, which molecule acts as the second messenger to open cation channels?

Accepted Answer

cAMP

Question 11

Which papillae on the tongue contain taste buds during childhood but fewer with age?

Accepted Answer

Foliate papillae

Question 12

Which cranial nerve transmits taste impulses from the anterior two-thirds of the tongue?

Accepted Answer

Facial nerve (CN VII)

Question 13

Which equation best describes the relationship between sound frequency ($$f) $$and wavelength ($$\lambda) in $$the cochlea, given the speed of sound ($$v$$)?

Accepted Answer

$$v = f 	imes \lambda$$

Question 14

Which structure in the inner ear is responsible for detecting rotational movements of the head?

Accepted Answer

Crista ampullaris in semicircular ducts

Question 15

What is the function of the otolithic membrane in the maculae of the utricle and saccule?

Accepted Answer

To increase the weight and inertia, aiding in detection of linear acceleration.

Question 16

Which equation describes the depolarization of hair cells in the cochlea due to K+ influx?

Accepted Answer

$$	ext{K}^+_{	ext{endolymph}} ightarrow 	ext{hair cell}$$

Question 17

Which type of hearing loss is caused by damage to the cochlear hair cells or auditory cortical cells?

Accepted Answer

Sensorineural deafness

Question 18

Which cranial nerve conducts sensory nerve impulses regarding both static and dynamic equilibrium?

Accepted Answer

CN VIII (vestibulocochlear nerve)

Question 19

Which three types of receptors provide input for CNS integration of balance and orientation?

Accepted Answer

Vestibular, somatic, and visual receptors

Special Senses: Structure and Function of the Eye, Ear, Olfactory, and Gustatory Systems

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