Biology

Biology, 14.07.2019 14:00, tsimonej12

The longer a muscle is when it starts contracting, the more tension it can generate in the contraction. the longer a muscle is when it starts contracting, the more tension it can generate in the contraction. a. true b. false

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Medicine, 20.07.2019 02:30, jennyferluna0216

The coupling of muscle excitation & muscle contraction involves the 2nd physiologic event. this process is best described by which of the following? a) an action potential propagates along the motor axon innervating the muscle fiber. b) the synaptic end bulb releases a neurotransmitter, causing the muscle to contract. c) ca2+ channels, stimulated by depolarizing t-tubules, open and release ca2+ ions to the sarcoplasm. d) crossbridge cycling & muscle contraction.

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Biology, 29.07.2019 20:50, kinglightskin2k

Match the description with the type of muscle contraction. 1. the length of the muscle changes. 2. no change in the length of the muscle. 3. the tension of the muscle increases during the contraction. 4. the tension of the muscle remains constant during contraction.

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Medicine, 21.08.2019 05:30, kelseyxxswd2932

An isometric contraction is described as select one: a. action potential frequency is high enough that no relaxation of muscle fibers occurs. b. a muscle produces constant tension during contraction. c. a muscle produces an increasing tension as the length remains constant. d. a muscle produces increasing tension as it shortens. e. a muscle produces tension, but the length of the muscle is increasing.

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Biology, 16.11.2019 00:31, Lesquirrel

Which of the following statements regarding contraction of a skeletal muscle fiber is true? a) thick filaments shorten when muscle fibers contract. b) some contractions occur without activation of myosin heads. c) contracting muscle fibers do not always shorten. d) contraction does not always require the occurrence of an action potential. e) contraction only occurs following summation of action potentials from many motor neurons.

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