
a.
To explain: The difference between single circulation and double circulation.
Introduction: Circulation refers to the movement of blood throughout the body through the blood vessels. Blood should be circulated throughout the body without any interruption to supply oxygen, nutrients, hormones, waste and some other chemicals required by the body tissues. A normal adult has five liters of blood that is circulated thousand five hundred times in a day.
b.
To explain: The difference between the circulatory system of amphibians and mammals.
Introduction: The circulatory system is also called the vascular system, through which the blood flows throughout the body. The function of the circulatory system is very much essential since it supplies all the essential molecules required by every cell of the body. Circulatory systems include heart, blood, and blood vessels which pumps the blood.

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Chapter 42 Solutions
Study Guide for Campbell Biology
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