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 & PHYSIOLOGY V1. W/CONNECT
- Larry goes to the doctor complaining that he cant see the right side of the visual field with either eye. Where in the visual signal-processing pathway is Larrys problem occurring?arrow_forwardExplain why different types of receptor cells and neural circuits are required for day and night vision.arrow_forwardGive exact location and function of optic nervearrow_forward
- Explain the Inhibition of Pain?arrow_forwardDiscuss the visual pathways in motor control, from when the information is registered on the retina and finally reaching the spinal cord effectorsarrow_forwardExplain how cadherin molecules aid hearing and the process of mechano-electrical coupling in cochlear hair cells.arrow_forward
- Explain Mechanism of generation of light-induced impulse in the retina.arrow_forwardDiagram a hypothetical reflex arc to explain the pupillary reflex observed when a penlight is shined into the left eye.arrow_forwardExplain why one early symptom of vitamin A deficiency is the impaired vision at night?arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage LearningHuman Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning