Tension decreases as Ca++ ions are pumped out of the sarcoplasm and cross-bridge cycling stops, during relaxation phase.
An involuntary contraction of the fibers that make up a muscle is called muscle twitch. Nerves controls the muscle fibers such that when something stimulates a nerve, it causes the muscle fibers to contract that results in a twitch. A person can often see or feel twitches below the skin.
Electrolyte imbalances can also cause muscle twitching. This could be due to excessive sweating, exercise, or loss of fluid from vomiting or diarrhea.
Relaxation of muscles takes place when stimulation of the nerve stops. Calcium is pumped back into the sarcoplasmic reticulum breaking the bond between actin and myosin. Actin and myosin return to their unbound state leading to the relaxation of muscles.
We can define twitch duration as the sum of the twitch time to peak tension and the half-relaxation time.
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