McGraw-Hill Online Learning Center Test<BLURT>

McGraw-Hill Online Learning Center Test

1. Review the animation and answer the following questions.

Prior to contraction, the release of calcium ions will

A. activate the globular "paddles" on the actin molecules.
B. reveal the globular "paddles" on the myosin molecules.
C. reveal binding sites on the actin molecules.
D. expose binding sites on the myosin molecules.

2. The actin and myosin filaments move relative to each other A. due to the formation of many crossbridges each pulling the molecules closer together.
B. because of repeated formation and release of crossbridges.
C. because of attraction between two actin molecules.
D. without the need for energy.

3. ATP is required to A. activate the binding sites on the actin molecules.
B. for movement of the actin relative to the myosin.
C. for formation of the crossbridges.
D. to provide the ADP required for the process.

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