Question

Sensory receptors of the special senses stimulated photoreceptor receptors detected functio 1 dim light not see and taste perception. Concept Map Use the terms in the Word Bank to complete the concept map. Refer to the next lab on hearing, smell bright light 10:0 see color OIO: Word Bank Photoreceptors (rods and cones Neural retina or tunic (layer) Light Rods

Answer 1

Ans1. Neural retina or tunic (layer)

The inner most layer of eye consisting photoreceptors (rods and cones) and neurons is called the nervous tunic, It consists of the retina which contains nervous tissue responsible for photoreception.

Ans 2. Photoreceptors (rods and cones)

The photoreceptors are the cells present in the eye that has ability to convert incoming light into an electrical signal that can be carried to the brain (via the optic nerve).Photoreceptors are of two types rods and cones.

Rods functions for vision at low light levels (scotopic vision) and they do not mediate color vision, while,cones are active at higher light levels (photopic vision), are responsible for color vision.

Ans 3. Rods

Rods consists a pigment known as rhodopsin or visual purple (a purplish pigment) which is rich in vitamin A. This pigment is responsible for the night vision and hence is responsible for vision in dim light . Rods are said to be sensitive to light, and the visual pigment is black-white.Rods do not produce colour vision.

Ans. 4 light

The photoreceptors consists of rods and cones when light strikes the photoreceptors,the rods and cones convert the light into electrical impulses which are then transmitted to the brain via nerve fibers(optic nerves). This signals are then processed in and hence, brain then determines, which nerve fibers carried the electrical impulse activate by light and then creates an image.