Q.
During the mechanism of vision, the cells which generate the first potential on stimulation be light is/are:
2016
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NTA AbhyasNTA Abhyas 2020Neural Control and Coordination
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Solution:
Mechanism of Vision
Light rays (of visible spectrum) are focussed on the retina via passing through the cornea and lens → Light induced dissociation of photosensitive compounds [(photopigments composed of opsin (a protein) and retinal (an aldehyde of vitamin A)] into retinal and opsin → Structural changes in opsin → Changes in membrane permeability → Potentials are generated in photoreceptor cells (rods and cones) → Production of a signal crosses the bipolar cells and reaches the ganglion cells → Generation of action potentials in the ganglion cells → Transmission of these action potentials (impulses) by the optic nerves upto the visual cortex area of the brain for the analysis.