Check your understanding of concepts from 23·15–23·16 The muscular and skeletal systems enable movement by answering the following questions.
1. Select the choice that correctly lists the two basic states of action in each muscle cell.
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2. If you had to propose a mechanical analogy to the system formed by the bones, joints and muscles of a person’s arm from the choices below, which one would you choose?
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3. What is the name of the neurotransmitter that gives the directive for a muscle cell to contract?
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4. The simplest type of skeleton found in the animal world is the:
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5. Which of the following is NOT one of the many functions of an endoskeleton?
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