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Muscle contraction is caused by
- a. actin filaments sliding past each other.
- b. myelin filaments sliding past each other.
- c. myosin filaments sliding past each other.
- d. actin filaments sliding past myelin filaments.
- e. actin filaments sliding past myosin filaments
correct:e
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Which of the following statements about H zones and I bands is TRUE?
- a. the H zones contain only myosin, while the I bands contain only actin
- b. the H zones contain only actin, while the I bands contain only myosin
- c. the H zones contain only myosin, while the I bands contain both actin and myosin
- d. the H zones contain both actin and myosin, while the I bands contain only actin
- e. the H zones and the I bands each contain both actin and myosin
correct: a
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During muscle contraction
- a. the A band remains the same and the I band narrows.
- b. the I band remains the same and the A band narrows.
- c. both the A band and I band remain the same.
- d. both the A band and I band narrow.
- e. both the A band and I band become wider.
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