Quiz 5

Question 1

The highest frequency sound is detected by

Answer 1

hair cells located near the oval window/stapes bone end of the basilar membrane.

Question 2

The hair cell of the cochlea is depolarized when the stereocilia are bent in any direction (True or False)?

Answer 2

False

Question 3

Which mechanism causes hair cell depolarization as stereocilia bend in response to sound waves?

Answer 3

Tip links open ion channels, which causes membrane depolarization.

Question 4

Movement of the cupula in the ampullae of the semicircular canals allows detection of

Answer 4

rotational movements.

Question 5

An area of the retina that contains only cones and is the site of sharpest vision is the

Answer 5

fovea.

Question 6

On a dark night, the rods have a high concentration of

Answer 6

cGMP.

Question 7

______ cells connect photoreceptors to ganglion cells.

Answer 7

Bipolar

Question 8

The photosensitive pigment synthesized from vitamin A is

Answer 8

retinal

Question 9

A decrease in the release of neurotransmitter from the photoreceptor would indicate a(n)

Answer 9

increase in light intensity

Question 10

The following steps occur in rods when they are excited by a photon of light. Place them in the correct sequence.

1. Membrane sodium channels close.
2. cGMP is broken down.
3. The membrane hyperpolarizes and the rate of neurotransmitter release declines. 4. Transducin is activated.
4. Opsin is activated.

Answer 10

B) 5, 4, 2, 1, 3

Question 11

Put these structures of the visual system in the order that they transmit light to the retina
. 1. lens
2. aqueous humor
3. cornea
4. vitreous humor

Answer 11

3, 2, 1, 4