35) Since each myofibril is attached at either end of the muscle fiber, when sarcomeres
shorten, the muscle fiber A) lengthens. B) shortens. C) strengthens. D) weakens. E) pulls from the middle. Answer: BLearning Outcome: 10-3Bloom's Taxonomy: Application36) After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as 37) In rigor mortis38) In a sarcomere, cross-bridge attachment occurs specifically in the39) Physical evidence that supports the sliding filament theory of muscle contraction includes A) constant distance between Z lines during contraction. B) decreased width of the H band during contraction. C) increased width of the I band during contraction.
D) decreased width of the A band during contraction. E) the I band + H band distance is constant during contraction. Answer: BLearning Outcome: 10-4Bloom's Taxonomy: Comprehension40) Triggering of the muscle action potential occurs after41) The following is a list of the events that occur during a muscle contraction. What is the correct sequence of these events?1. Myosin cross-bridges bind to the actin.2. The free myosin head splits ATP.3. Calcium ion is released from the sarcoplasmic reticulum.4. The myosin head pivots toward the center of the sarcomere.5. Calcium ion binds to troponin.6. The myosin head binds an ATP molecule and detaches from the actin.
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- Fall '08