Human Anatomy & Physiology (9th Edition)

Published by Pearson
ISBN 10: 0321743261
ISBN 13: 978-0-32174-326-8

Chapter 15 - The Special Senses - Review Questions - Page 589: 33

Answer

Rhodopsin is the visual pigment (visual purple ) of rod light receptor cells. Rhodopsn is synthesized and accumulates in the dark Rhodopsin is a compound of the 11-cs retinal form of retinal and the protein opsin. When light strikes rhodopsin the 11-cis-retinal is converted to the all-trans for. All-trans retinal activates transducin which activates phosphodiesterase . PDE converts cGMP to GMP and the decrease in cGMP closes the cation channels The result is hyperpolarization of the light receptor cell..

Work Step by Step

11-csretnalopsin plus light goes to all-trans retinal rhodopsin. opsin activate trandsducin which activates phosphodiesterase(PDE) Pde cleaves cGMP. The cation channels close, the photoreceptor is hyperpolarized -40mV to -70mV and a signal is generated.
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