Describe the initiation of visual impulse, Biology

Assignment Help:

Describe the Initiation of Visual Impulse

When light falls on the retina it is absorbed by the photosensitive pigments of rods (rhodopsin) and cones (photopsin). It initiates photochemical changes such as rhodopsin bleaching and regeneration that stimulate electrical changes. Rhodopsin consists of a protein (opsin) and a carotenoid-11-cis retinal. Light that is absorbed by rhodopsin converts 11-cis retinal into trans retinal. This process is an isomerisation that occurs through the formation of many chain reactions and the reduction of c-GMP. The reduction of c-GMP is responsible for closure of sodium channel, leading to hyperpolarisation and electric response in bipolar cells and other neural cells. Thus producing electric response. Then all trans retinal reisomerise into 11-cis retinal and then combine with opsin to form rhodopsin. A similar process occurs for photopsin.

 


Related Discussions:- Describe the initiation of visual impulse

Coronary prevention, a) The West of Scotland Coronary Prevention Study (WOS...

a) The West of Scotland Coronary Prevention Study (WOSCOPS): The study randomized healthy men between the ages of 45 and 64 years with TC levels higher that 252 mg/dL and LDL chole

Describe the origin of muscle cramps and pains, Q. How can the knowledge ab...

Q. How can the knowledge about fermentation describe the origin of muscle cramps and pains after intense physical exertion? A typical fermentation process due to oxygen scarcit

Will argon tend to form bonds with other elements, The atomic number of arg...

The atomic number of argon is 18. Will argon tend to form bonds with other elements? Describe your answer. Argon will not tend to form bonds with other elements. With an atomi

Animal kingdom, If porifers shiw cell aggregate plan tgen how can they also...

If porifers shiw cell aggregate plan tgen how can they also shiw division of labour among cells

Which disease is associated with rapid dehydration, Which disease is associ...

Which disease is associated with the following symptoms? Sudden onset of profuse watery stool followed by vomiting, rapid dehydration and muscular cramps?

How vitamin c play important role in the preventionof cancer, How Vitamin C...

How Vitamin C play important role in the preventionof Cancer? Vitamin C based on research evidence plays an important role in the prevention and treatment of cancer. Its anti c

Microbiology, Bacteria, mutations, recombination, evolution, and adaption, ...

Bacteria, mutations, recombination, evolution, and adaption, how are all these related; must be written in two sentences.

How are the epithelial tissues classified, Q. How are the epithelial tissue...

Q. How are the epithelial tissues classified? The epithelial tissues are classified according to the shape of the cells that form it epithelial cells may be columnar, cuboidal,

Internal structure of the heart of man, Internal structure of the heart of ...

Internal structure of the heart of man Internally there are four chambers in the heart. The upper two chambers are called auricles and the lower two chambers are called vent

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd