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19 Nov 2019
In contraction in a muscle fiber, when one looks closely at the protein filaments in the sarcomere, what is happening to the actin and myosin filaments when contraction occurs? a. the sarcomere is shortening, because the amount of overlap between actin and myosin is increasing b. the sarcomere is shortening, because the actin and myosin filaments are coiling more tightly, causing shortening c. neither of these occurs in the sarcomere When an action potential arrives at the neuromuscular junction (NMJ), the electrical impulse from the motor neuron is transferred to what part of the muscle fiber? a. the T Tubules b. the mitochondria c. the vesicles of ACh d. the motor endplate
In contraction in a muscle fiber, when one looks closely at the protein filaments in the sarcomere, what is happening to the actin and myosin filaments when contraction occurs? a. the sarcomere is shortening, because the amount of overlap between actin and myosin is increasing b. the sarcomere is shortening, because the actin and myosin filaments are coiling more tightly, causing shortening c. neither of these occurs in the sarcomere When an action potential arrives at the neuromuscular junction (NMJ), the electrical impulse from the motor neuron is transferred to what part of the muscle fiber? a. the T Tubules b. the mitochondria c. the vesicles of ACh d. the motor endplate
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