Answered: blindness can result from the loss of…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question

Colour blindness can result from the loss of specific types of cones, or it can occur in individuals having fewer cones of a given type.

An individual has 50% less than the normal number of green cone photoreceptors in his or her retina. How would this affect his or her vision?

a. This person has night blindness. He or she should start to eat more carrots to replenish the stock of retinal molecules in the retina.

b. This person will have difficulty adapting to varying light levels. His or her cone receptors take much longer to adapt in a brightly lit area.

c. This person does not have a colour blindness because no green cone photoreceptors are in the retina; only red, yellow, and blue photoreceptors exist.

d. This person has a mild green colour blindness. He or she cannot see green colours very clearly and has difficulty distinguishing colours involving green hues.

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