What is the correct order of events in the sliding filament theory of muscle contraction? 1.Myosin head binds to actin
2)Calcium ions bind to troponin
3)Myosin cross-bridges bend,pulling actin toward center of sarcomere
4)ATP is split into ADP and P
5)Tropomyosin moves to expose active sites of actin
6)Sarcoplasmic reticulum releases calcium ions
7)ADP and P released from myosin
A)2,4,6,1,3,5,7
B)1,2,3,4,5,6,7
C)6,2,5,4,1,7,3
D)4,2,7,1,6,5,3

Question

Quizplus · Accepted Answer

The correct sequence starts with the release of calcium ions from the sarcoplasmic reticulum (6), which then bind to troponin (2). This causes tropomyosin to move and expose the active sites on actin (5). ATP is then split into ADP and P to energize the myosin head (4), allowing it to bind to actin (1). ADP and P are released from myosin, which strengthens the binding (7), and finally, the myosin cross-bridges bend, pulling actin toward the center of the sarcomere (3).

What Is the Correct Order of Events in the Sliding