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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.
Golgi complex is the organelles in animal cells having a sequence of þattened sacs which sort, chemically modify, and package proteins produced on the rough endoplasmic reticulum.
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COMPOUN D EPITHELIA (MULTILAYERED EPITHELIA) - These are made up of more than one layer of cells. The compound epithelia may be stratified and transitinal. 1 .
Ask questionLIMITATION OF ECOLOGICAL PYRAMIDS #Minimum 100 words accepted#
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Explain Fetal Development? The medical profession divides pregnancy into three-month stages called trimesters. At the end of the first trimester, the fetus is only about 5 cm l
Life Forms - Qualitative Characters The form and structure of terrestrial communities are determined by the nature of vegetation. Vegetation may be classified according to gro
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Q. Define Primary and Somatic Sensory Area? Primary Sensory Area - Located in postcentral gyrus in parietal lobes (just posterior to central sulcus). Neurons here receive info
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