1. With age, the collagen-containing connective tissue coverings of skeletal muscles increase and the number of muscle fibers decreases. Is meat from an older or a younger animal more tender? Explain. 2. Weight training increases muscle fiber size by increasing the number of myofibrils. Explain. 3. The diaphragm is a muscle that controls inspiration. Is control of the diaphragm voluntary, involuntary, or both? Explain.

1. With age, the collagen-containing connective tissue coverings of skeletal muscles increase and the number of muscle fibers decreases. Is meat from an older or a younger animal more tender? Explain. 2. Weight training increases muscle fiber size by increasing the number of myofibrils. Explain. 3. The diaphragm is a muscle that controls inspiration. Is control of the diaphragm voluntary, involuntary, or both? Explain.

Fundamentals of Sectional Anatomy: An Imaging Approach

2nd Edition

ISBN:9781133960867

Author:Denise L. Lazo

Publisher:Denise L. Lazo

Chapter4: Neck

Section: Chapter Questions

Problem 7RQ

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Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
During exercise, the oxygen consumption (VO2) of the skeletal muscles may account for more than A. 65 percent of the total VO2 B. 75 percent of the total VO2 C. 85 percent of the total VO2 D. 95 percent of the total VO2
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