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Student Center Anatomy and Physiology, Second Edition
The unity of form and function
Kenneth S. Saladin
Student Center

Chapter 12: Muscular Tissue

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 Comprehension Test

    2. Without ATP, relaxed muscle cannot contract and muscle that is already contracted cannot relax. Explain why.
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    3. ISlight pH variations can cause enzymes to change conformation and can reduce enzyme activity. Explain how this relates to muscle fatigue.
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    4. Why would skeletal muscle be unsuitable for the wall of the urinary bladder? Discuss this in terms of unity of form and function at the cellular and molecular level.
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  4. As skeletal muscle contracts, one or more bands of the sarcomere become narrower and disappear, and one or more of them remain the same width. Which bands will change–A, H, and/or I–and why?
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    6. Botulism occurs when a bacterium, Clostridium botulinum, releases a neurotoxin that prevents motor neurons from releasing ACh. In view of this, what early symptoms of botulism would you predict? Explain how a person with botulism could die of suffocation as the disease progressed.
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