HUMAN ANATOMY PKG >CUSTOM<
HUMAN ANATOMY PKG >CUSTOM<
8th Edition
ISBN: 9781323572528
Author: Marieb
Publisher: Pearson Custom Publishing
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Chapter 10, Problem 3CRCAQ

Chickens are capable of only brief bursts of flight, and their flying muscles consist of fast glycolytic fibers. The breast muscles of ducks, by contrast, consist of slow and fast oxidative fibers. What can you deduce about the flying abilities of ducks?

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A study of muscle fibers between chimpanzees and humans revealed that although muscle mass per body size are approximately equivalent, the ratio of red (slow) and white (fast) fibers were significantly different. Chimps tend to have a ratio of 30% red to 70% white where humans are 60/40 respectively.  Speculate about what this ratio difference means in terms of muscle activity potential and a possible evolutionary significance of this difference.
Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? 23. A. skeletal muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. B. smooth muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require an extracellular inward-Calcium-current to stimulate the An burst of Calcium from intracellular stored-Calcium-organelles. D. No type of muscle cell requires an extracellular inward-Calcium current for normal contractile-function.
Explain why some domesticated birds, like turkeys andchickens, have mostly fast-twitch fibers in their breast(wing) muscles, whereas wild birds like geese and duckshave mostly slow-twitch fibers in those muscles.
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