Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 12 - Think and Discuss: 87

Answer

As any object increases in size, the surface area grows at a slower rate than the mass does. A simple, straight intestinal tract that works for a worm will not have enough surface area if scaled up to human size. Therefore, humans have a relatively long and "complex and extensively folded intestinal tract" so that the area will be large enough to digest food that passes through.

Work Step by Step

This is discussed on pages 236-237.
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