Question 1
In an isotonic contraction, the muscle ________.
◦ changes in length and moves the "load"
◦ rapidly resynthesizes creatine phosphate and ATP
◦ never converts pyruvate to lactate
◦ does not change in length but increases tension
Question 2
Which of the following is the correct sequence of events for muscle contractions?
◦ muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR, sliding of myofilaments
◦ neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
◦ neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
◦ motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments
Child with cerebral palsy has abnormal muscle tone and lack of physical coordination.
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