Biological Science
Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 49, Problem 5TYK
Summary Introduction

To review:

The location of photoreceptors that are involved in sensing day length in mammals, lizards and birds.

Introduction:

The day length plays a crucial role in reproduction of various organism, an increase in day length or photoperiod during summer stimulates the release of sex hormones in seasonally reproducing mammals, lizards, and birds. Photoreceptors are the sensory receptors that respond to light, and their location depends on the animal. These photoreceptors receives the photoperiod and send signals to the hypothalamus, which in response releases the sex hormone.

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