12 Facts About Muscular contraction

1.

Muscle Muscular contraction is the activation of tension-generating sites within muscle cells.

FactSnippet No. 1,427,980
2.

The termination of muscle Muscular contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state.

FactSnippet No. 1,427,981
3.

In contrast, a muscle Muscular contraction is isotonic if muscle tension remains the same throughout the Muscular contraction.

FactSnippet No. 1,427,982
4.

The Muscular contraction produced can be described as a twitch, summation, or tetanus, depending on the frequency of action potentials.

FactSnippet No. 1,427,983
5.

In skeletal muscle, excitation–Muscular contraction coupling relies on a direct coupling between key proteins, the sarcoplasmic reticulum calcium release channel and voltage-gated L-type calcium channels .

FactSnippet No. 1,427,984
6.

Excitation–Muscular contraction coupling occurs when depolarization of skeletal muscle cell results in a muscle action potential, which spreads across the cell surface and into the muscle fiber's network of T-tubules, thereby depolarizing the inner portion of the muscle fiber.

FactSnippet No. 1,427,985
7.

Physiologically, this Muscular contraction is not uniform across the sarcomere; the central position of the thick filaments becomes unstable and can shift during Muscular contraction but this is countered by the actions of the elastic myofilament of titin.

FactSnippet No. 1,427,986
8.

Finally, if the frequency of muscle action potentials increases such that the muscle Muscular contraction reaches its peak force and plateaus at this level, then the Muscular contraction is a tetanus.

FactSnippet No. 1,427,987
9.

In both skeletal and cardiac muscle excitation-Muscular contraction coupling, depolarization conduction and Ca release processes occur.

FactSnippet No. 1,427,988
10.

Excitation-Muscular contraction coupling in cardiac muscle cells occurs when an action potential is initiated by pacemaker cells in the sinoatrial node or Atrioventricular node and conducted to all cells in the heart via gap junctions.

FactSnippet No. 1,427,989
11.

In 1952, the term excitation–Muscular contraction coupling was coined to describe the physiological process of converting an electrical stimulus to a mechanical response.

FactSnippet No. 1,427,990
12.

Mechanism for muscle Muscular contraction evaded scientists for years and requires continued research and updating.

FactSnippet No. 1,427,991