Question

pls answer all 4 questions with explanation if possible

QUESTION 1

Thanks to the _______________, when you take a picture of your cat its eyes glow in the picture; this allows for better night vision.

QUESTION 2

Phototransduction in rods involves the G-protein transducin. Light leads to the bleaching of rhodopsin which stimulates transducin in the disk membrane, which in turn activates the effector enzyme_________________ (full name), which breaks down the cGMP that is normally present in the cytoplasm of the rod (in the dark) thanks to the enzyme guanylyl cyclase. Reduction in cGMP causes ________________________(name of ion) channels to close and the membrane then hyperpolarizes.

QUESTION 3

The _______ nerve is a bundle of axons from the retina allowing for visual information to be sent to the brain for processing.

QUESTION 4

The location where optic nerve fibers exit the retina is known as the ______.

	a.	Macula
	b.	Fovea
	c.	Blind spot
	d.	Optic nerve fibers don't exit the retina

Answer 1

1.
Tapetum lucidum, a photoreceptor allows light to bounce back.
Hence answer is Tapetum lucidum.

2.
Phototransduction in rods involves the G-protein transducin. Light leads to the bleaching of rhodopsin which stimulates
transducin in the disk membrane, which in turn activates the effector enzyme Phosphodiesterase.
which breaks down the cGMP which is present in cytoplasm of rod. Reduction of cGMP causes
cGMP-gated cation channels to close and the membrane then hyperpolarizes.

3.Optic nerve is a bundle of axons from the retina allowing for visual information to be sent to the brain for processing.
4.
The place where optic nerves leave eye ball is known as blind spot.
The blind spot do not have photoreceptors and because of this, there is no detection in this area.
Option c is the answer.