Question 1
The tension generated in a skeletal muscle fiber is directly proportional to the number of
◦ nebulin and titin molecules present.
◦ high-force crossbridges formed.
◦ active sarcomeres.
◦ thick and thin filaments present.
◦ low-force crossbridges formed.
Question 2
When a skeletal muscle cell contracts and the muscle shortens,
◦ myosin heads generate a single power stroke.
◦ the actin ATPase allows the actin molecule to swivel.
◦ the position of an actin molecule relative to a myosin molecule does not change.
◦ the actin molecule swivels during the power stroke.
◦ some myosin heads are forming crossbridges as others are releasing them.
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cell
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