Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • NCERT
  • Explain the following: b) Mechanism of generation of light-induced impulse in the retina.

Q8.    Explain the following:

         a) Mechanism of generation of light-induced impulse in the retina.

Answers (1)

Light enters the eye through the pupil. The lens then focuses the light on the retina where an electric impulse is generated. The retina contains several light-sensitive photoreceptor cells called rods and cones which convert light energy to this electric impulse. There are photosensitive compounds (photo-pigments), namely rhodopsin present in these photoreceptor cells which are composed of opsin and retinal. Light induces dissociation of retinal from opsin which changes the structure of opsin through isomerization, especially in the permeability of the cell membrane. Due to this, the sodium ion channels of the cell membrane are closed. It generates an action potential as potential differences are created in the photoreceptor cells. Furthermore, an action potential gets created in the ganglion cells through the bipolar cells. These impulses/action potentials are transmitted by the optic nerves to the visual cortex of the brain where these neural impulses are analyzed and interpreted by the brain and the image formed is then recognized. 

 

 

Posted by

Priyanka Kumari

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

PM Modi's Pariksha Pe Charcha 2025 to be held next month, registrations open till January 14
anam-khan

CBSE Board Exams 2025: Online portal for availing exemptions by CWSN students opens
anam-khan

Board Exams: States agree to equivalence; no question paper ‘jumbling’ from next year, says PARAKH CEO

Latest Question