1. Tardigrade
  2. Question
  3. Biology
  4. During the mechanism of vision, the cells which generate the first potential on stimulation be light is/are:

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. During the mechanism of vision, the cells which generate the first potential on stimulation be light is/are:

NTA AbhyasNTA Abhyas 2020Neural Control and Coordination

Solution:

Mechanism of Vision
Light rays (of visible spectrum) are focussed on the retina via passing through the cornea and lens $ \rightarrow $ Light induced dissociation of photosensitive compounds [(photopigments composed of opsin (a protein) and retinal (an aldehyde of vitamin A)] into retinal and opsin $ \rightarrow $ Structural changes in opsin $ \rightarrow \, $ Changes in membrane permeability $ \rightarrow $ Potentials are generated in photoreceptor cells (rods and cones) $ \rightarrow \, $ Production of a signal crosses the bipolar cells and reaches the ganglion cells $ \rightarrow $ Generation of action potentials in the ganglion cells $ \rightarrow $ Transmission of these action potentials (impulses) by the optic nerves upto the visual cortex area of the brain for the analysis.