The Eye & The Action (Receptor) Potential

The Eye & The Action (Receptor) Potential The Eye & The Action (Receptor) Potential - Start

2018-11-25 12K 12 0 0

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Packet #20. Chapter #49. Structure of the Eye. The Retina. Contains two types of photoreceptors. Rods. Black and white vision. Cones. Color vision. These photoreceptors connect to a series of neurons that ultimately lead to the optic nerve which ultimately leads to the brain.. ID: 733566 Download Presentation

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The Eye & The Action (Receptor) Potential




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Presentations text content in The Eye & The Action (Receptor) Potential

Slide1

The Eye & The Action (Receptor) Potential

Packet #20

Chapter #49

Slide2

Structure of the Eye

Slide3

The Retina

Contains two types of photoreceptors

Rods

Black and white vision

Cones

Color visionThese photoreceptors connect to a series of neurons that ultimately lead to the optic nerve which ultimately leads to the brain.

Slide4

The Structure of the Rod

Contains disks that has the protein called

rhodopsin

within the disk’s membrane.

Rhodopsin

Contains two polypeptide chains called retinal and opsin

.

Slide5

Retinal

Exists in two forms

Cis

isomer

Exists when there is absence of light

Trans isomerExists when there is a presence of light

Slide6

The Production of a Receptor Potential in a Rod Cell

Light isomerizes retinal, which activates

rhodopsin

.

What

type of enzyme would be used to make the change?Retinal changes from the

cis

form to the

trans

form.

Ultimately causes

rhodopsin

to

become active.

Slide7

Production of a Receptor Potential I

Light isomerizes retinal, which activate

rhodopsin

.

Slide8

Production of a Receptor Potential II

Active

rhodopsin

in turn activate a G protein called

transducin

.

Slide9

Production of a Receptor Potential III

Transducin

activates the enzyme

phodiesterase

(PDE).

Slide10

Production of a Receptor Potential IV

Activated PDE detaches cyclic

guanosine

monophosphate

(cGMP) from Na+ channels in the plasma membrane by hydrolyzing

cGMP

to GMP.

Slide11

Production of a Receptor Potential IV

The sodium channels close when

cGMP

detaches. The membrane’s permeability to Na

+

decreases, and the rod hyperpolarizes.

Slide12

The Big Picture

Slide13

Production of a Receptor Potential VI

The action potential moves along a series of nerve cells.

Horizontal

Bipolar

Amacrine

Ganglion cellThe message ultimately reaches the optic nerve fibers which lead to the brain.

Slide14

Homework

Know how the eye focuses.

Know the cause of near and far sightedness.

Slide15


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