Use the answer choices below to match to the following descriptions. Choices can be used more than once. 1: Calcium source comes from T-tubules and sarcoplasmic reticulum 2: Muscle twitches can summate 3: Peak contraction occurs during the action potential. 4: Muscle fibers start to relax during absolute refractory period 5: Muscle fibers are striated 6: Muscle fibers are out of absolute refractory period BEFORE contraction even begins! 7: Expresses a Ca2+-Na+ exchanger on the cell membrane to remove calcium匹配题

A

both skeletal and cardiac muscle

B

skeletal muscle

C

cardiac muscle

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