Stretching exercises are designed to lengthen the muscle tissue and help it relax to its normal resting state.判断题
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What is the smallest contracting unit of muscle tissue?
Question at position 3 Which structural feature enables the rapid propagation of the action potential deep within the muscle fiber?Z-discsTransverse tubules (T-tubules)Sarcoplasmic reticulum cisternaeM-linesClear my selection
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
Question at position 7 The major function of the sarcoplasmic reticulum in skeletal muscle contraction is to: provide a source of myosin for the contraction processstore ATPregulate intracellular calcium concentrationsynthesize actin and myosin myofilaments
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