Testing Your Comprehension

Chapter ll Muscular Tissue 44l

  1. Without ATP, relaxed muscle cannot contract and a contracted muscle cannot relax. Explain why.
  2. Slight pH variations can cause enzymes to change conformation and can reduce enzyme activity. Explain how this relates to muscle fatigue.
  3. Why would skeletal muscle be unsuitable for the wall of the urinary bladder? Explain how this illustrates the complementarity of form and function at a cellular and molecular level.
  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, or I—and why?
  5. Botulism occurs when a bacterium, Clostridium botulinum, releases a neurotoxin that prevents motor neurons from releasing ACh. In view of this, what early signs of botulism would you predict? Explain why a person with botulism could die of suffocation.

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