1. Which of the following needs an ATPase during the contraction and relaxation

ID: 3522098 • Letter: 1

Question

1. Which of the following needs an ATPase during the contraction and relaxation of skeletal muscle?

a)Myosin heads detach from actin

b)Myosin heads bind to actin

c)Calcium is released from the sarcoplasmic reticulum

d)Active site on the actin are exposed

e)None of the above

2. Arrange the following events in the correct order during a single stimulation of a skeletal muscle.

1. Active sites on actin myofilaments are exposed

2. Actin myofilament slides over myosin myofilament

3. Ca2+ ion binds to troponin

4. Myosin heads move

5. Cross bridges form

a)1,2,3,4,5

b)3,1,5,4,2

c)2,4,3,5,1

d)3,2,5,4,1,

e)4,3,2,1,5

3. For skeletal muscle contraction ATP is required for the following events EXCEPT

a)Decreasing cytoplasmic calcium concentration

b)Detaching myosin head from binding to actin

c)Power stroke

d)Increasing intracellular calcium

e)All of the above need ATP

c)Calcium is released from the sarcoplasmic reticulum

2.b)3,1,5,4,2

In sequence

Ca2+ ion binds to troponin

Active sites on actin myofilaments are exposed

. Cross bridges form

Myosin heads move

. Actin myofilament slides over myosin myofilament

3.e. all of the above.

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