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The following is a list of the events that occur during a muscle contraction. Choose the one that occurs last

1. Myosin cross-bridges bind to the actin.
2. The free myosin head splits ATP.
3. Calcium ion is released from the sarcoplasmic reticulum.
4. The myosin head pivots toward the center of the sarcomere.
5. Calcium ion binds to troponin.
6. The myosin head binds an ATP molecule and detaches from the actin.

a. 3,5, 1,4,6,2
b. 1,4,6,2,3,5
c. 3,5, 1,2,4,6
d.5, 1,4,6,2,3
e. 1,3,5,4,6,2

Respuesta :

The answer is a) 3,5,1,4,6,2. Muscle contraction is defined as the muscle response to a stimulus that involves the interaction of the contractile proteins actin and myosin in the presence of calcium.

The correct sequence of muscle contractions is:

3. Calcium ions are released from the sarcoplasmic reticulum

5. Calcium ions binding to Troponin

1. Myosin Bridges Bind Actin

4. The myosin head pivots towards the center of the sarcomere

6. Myosin heads bind to ATP molecules and are detached from actin filaments

2. Free myosin head cleaves ATP.

The movement of muscle shortening occurs when the myosin head attaches to actin and actin is pulled inward. This action requires energy provided by ATP. Myosin binds to actin at the binding site of the globular actin protein. Myosin has another binding site for ATP where enzymatic activity hydrolyzes ATP to ADP, releasing an inorganic phosphate molecule and energy.

Learn more about muscle contraction visit: https://brainly.com/question/1990110

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