Find the correct sequence of steps of mechanism of muscular contraction from the following: Choose the correct option:

Question

Question

This question was previously asked in

UGC NET Paper 2: Physcial Education 4 Dec 2019 Shift 2

ATP breaks down, calcium released, inactivation of troponin, myosin pulls actin, actin myosin coupled, action potential generated
Calcium relased, action potential generated, ATP breaks down, inactivations of troponin, actin and myosin coupled, myosin pulls actin
Action potential generated, calcium released, inactivation of troponin, actin and myosin coupled, ATP breaks down, myosin pulls actin
Action potential generated, inactivation of troponin, calcium relased, ATP breaks down, myosin pulls actin, actin and myosin coupled

Answer 1

Muscular contraction is the process by which muscle fibers generate tension and pull on bones to produce movement.

Key Points Muscular contraction involves the interaction between actin and myosin filaments and the consumption of ATP to power the process.

The correct sequence of steps for the mechanism of muscular contraction is as follows:

Action potential is generated in the muscle fiber.
Calcium ions are released from the sarcoplasmic reticulum.
Inactivation of troponin: Calcium binds to troponin, which moves tropomyosin and exposes the binding sites on actin.
Actin and Myosin coupled: Myosin heads attach to actin, forming cross-bridges.
ATP breaks down: ATP is hydrolyzed, providing energy for myosin to pull actin towards the center of the sarcomere.
Myosin pulls Actin: Actin and myosin slide past each other, shortening the sarcomere and generating force.