Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 45, Problem 6TY
The function of Ca2+ in skeletal muscle contraction is to
- a. cause an allosteric change in myosin so that it detaches from actin.
- b. provide the energy necessary for the movement of the cross-bridge.
- c. expose the myosin-binding sites on the thin filaments.
- d. stimulate an action potential in the muscle fiber.
- e. do a and c only.
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The function of Ca2+ in skeletal muscle contraction is toa. cause an allosteric change in myosin so it detaches from actin.b. provide the energy necessary for the movement of the cross-bridge.c. expose the myosin-binding sites on the thin filaments.d. bind to tropomyosin.e. do a and c only.
The function of ATP during muscle contraction is toa. cause an allosteric change in myosin so it detaches from actin.b. provide the energy necessary for the movement of the cross-bridge.c. expose the myosin-binding sites on the thin filaments.d. do all of the above.e. do a and b only.
During the contraction of a vertebrate skeletal muscle fiber,calcium ions(A) break cross-bridges as a cofactor in hydrolysis of ATP.(B) bind with troponin, changing its shape so that the myosinbinding sites on actin are exposed.(C) transmit action potentials from the motor neuron to themuscle fiber.(D) spread action potentials through the T tubules.
Chapter 45 Solutions
Biology
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