Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

For vertebrate photoreception, define: (a) photopigment; (b) photoreceptor; and (c) receptive field.

Summary Introduction

To review:

The definition of photopigment, photoreceptor, and receptive field in vertebrate photoreception.


Human eye resembles the eye of all types of vertebrates. Vertebrate eye including human eye consists of the cornea, lens, pupils, iris, and retina. Light from the object is received by the cornea and it then passes to the iris. The dilation of pupil increases or decrease the light intensity. The lens focuses the image on the retina. The nerves from the retina converge into the optic nerve leading to the brain.


The vertebrate photoreception includes the following terms:


A photopigment is found in the photoreceptor cells of the retina. These pigments are composed of several different opsin proteins. Opsin is light sensitive pigment helps in converting the light into chemical signals. Photoreceptor rods contain a pigment called rhodopsin and cones contain idopsin pigment.


They are made up of photoreceptor cells commonly found in the retina of the human eye.

There are three types of photoreceptor in humans. Such types include rods (low-intensity light), cones (detection of a different wavelength), and retinal ganglion cells...

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