BY Lab Quizzes for Final 2 - Quiz 6 1 During the power...

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Quiz 6 1) During the power stroke in skeletal muscle, the myosin head releases the Pi. 2) During an action potential along the sarcolemma of a skeletal muscle, Na+ influxes into the cell to cause the depolarization. 3) In skeletal muscle, the ryanodine receptor (RyR) is a gated channel for Ca++ . 4) The motor neuron synapses with the skeletal muscle cell at the neuromuscular junction. True 5) In skeletal muscle, the myosin head performs a “power stroke” to pull actin during the muscle contraction, breaks down ATP into ADP and Pi, and binds to actin in a cross bridge formation. 6) The functional unit of a myofibril is called a sarcomere. 7) In skeletal muscle, the thin filament is composed of actin, troponin, and tropomyosin. 8) T-tubules are invaginations of the sarcolemma of a skeletal muscle cell that allow the action potential to rapidly travel deep into the cell. 9) In a skeletal muscle cell at rest, the concentration of sodium is higher on the outside of the cell than the inside . 10) Nicotinic receptors on the motor end plate are gated channels for Na+ and K+. 11) In skeletal muscle, troponin and tropomyosin, Quiz 7 1) During the action potential of a contractile cell in the heart, influx of Na+ causes the depolarization. 2) The contractile cells in the heart have no resting potential. False 3) During an action potential in the autorhythmic cells of the heart, Ca++ acts as a

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