Introduction:
The perception of items that are present in the surroundings is termed as sight or vision. This perception occurs by means of reflection or emission of light from those objects. The retina, the neural component, is one of the principle components of the eyeball. It consists of three cell layers that are composed of ganglion cells, bipolar cells, and photoreceptor cells. The photoreceptor cells are involved in the absorption of light and produce an electrical or chemical signal. These cells are of three kinds, namely cones, rods, and some ganglion cells. These cone and rod cells generate visual images and these cells are related to ependymal cells present in the brain. Photopsin and rhodopsin is the visual pigment present in the cone cell and rod cell, respectively. Cone cells are responsible for photopic vision (day vision) and trichromatic vision (color vision), and rod cells are responsible for scotopic vision (night vision).
Want to see the full answer?
Check out a sample textbook solutionChapter 16 Solutions
Anatomy and Physiology
- Explain why different types of receptor cells and neural circuits are required for day and night vision.arrow_forwardHuman color vision is "produced" by the nervous system based on how three different cone receptors interact with photons oflight in the eye. These three different types of cones interact with photons of different frequency light, as indicated in the following chart:arrow_forwardDescribe the effect on vision of a tumor in the hypothalamus or pituitary gland that compresses the optic chiasma, destroying the axons crossing through this structure.arrow_forward
- Explain M-fibers and P-fibers axon types that exit the eye. Where do these fibers project (and on what pathways)?arrow_forwardThe correct pathway of activation (by sending neuronal signals) in the retina is bipolar cell - retinal ganglion cell - photoreceptor photoreceptor - retinal ganglion cell - bipolar cell retinal ganglion cell - bipolar cell - photoreceptor photoreceptor - bipolar cell - retinal ganglion cell O bipolar cell - photoreceptor - amacrine cellarrow_forwardIdentify the afferent/sensory nerve involved in the light reflex and the efferent/motor nerve involved in the light reflex.arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning