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

Protection of plants against toxic substances, Protection of Plants against...

Protection of Plants against Toxic Substances Plants produce several toxic substances themselves and may also encounter the ones produced by other plants or present in the env

Define uses isolated soybean proteins, Define uses isolated soybean protein...

Define uses isolated soybean proteins? Partially hydrolysed soy proteins possess good foam stabilization properties and can be used as whipping agents in combination with egg a

Autumn (fall) overturn, Autumn (fall) overturn In autumn or early wint...

Autumn (fall) overturn In autumn or early winter the air temperature falls, resulting in the cooling of the surface waters. When the surface water cools to 4°C it becomes dens

Llustrate the role of each area in the evolution of the hebe, llustrate the...

llustrate the role of each area in the evolution of the Hebe Uses appropriate examples from the Hebe data to illustrate the role of each area/concept in the evolution of the He

Define about the physical fitness, Define about the Physical Fitness? P...

Define about the Physical Fitness? Physical fitness is a general term we come across quite often and use it to describe an individual if he or she is able to carry out a variet

Define the starch gel electrophoresis, Define the Starch gel electrophoresi...

Define the Starch gel electrophoresis? Starch gel has the advantage of fine texture and absence of protein adsorption with a molecular sieving effect retarding proteins of larg

Why do male and female gametes diffrent from each other, Q. Concerning thei...

Q. Concerning their size and basic morphology how and why do the male and the female gametes differentiate from each other? The female gametes are big cells full of vitellus (n

Egestion, After the food intake is over, the food gets digested, assimilate...

After the food intake is over, the food gets digested, assimilated and finally egested through the kidneys and anus. The urinary system: • Filters waste materials from the blood

How is the gymnosperm seeds formed, Q. How is the gymnosperm seeds formed? ...

Q. How is the gymnosperm seeds formed? What are the ploidies of the structures that compose the seeds? Their seeds are produced from differentiation of the megasporangia in the

Type of bacterial food poisoning, Type of bacterial food poisoning In...

Type of bacterial food poisoning Infection type: The infection type results from the release of toxin in the bowel by microorganisms taken in foods, e.g., Salmonella or Vibr

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