The a voluntary muscle contracts involuntarily, you will see a little movement through your skin. These movements are often called Tics, Twitches, and Spasms. If the involuntary contractions are widespread and very energetic, they may be called, "Seizures".
It is both. I involuntarily contracts to stabilize the spine just before you move to do something. Also, you are able to move it on your own.
The muscle that contracts when the leg is extended at the knee is call the gastrocnemius muscle
When a muscle cramp occurs, the muscle contracts forcibly and involuntarily and doesn't relax for the time the cramp lasts. The cramp can last from few seconds up to few minutes.
Errector Pilli Muscle
A spasm is described as a muscle which quickly contracts involuntarily and suddenly. This can be painful. According to the part of the body where the spasm occurs, the cause can stem from various factors. However, in general a spasm will occur if a muscle is overused, therefore running out of energy.
A muscle becomes shorter when it contracts.
No they are in the buttocks
A spasm is described as a muscle which quickly contracts involuntarily and suddenly. This can be painful. According to the part of the body where the spasm occurs, the cause can stem from various factors. However, in general a spasm will occur if a muscle is overused, therefore running out of energy.
A muscle that contracts shortens whereas a muscle that relaxes lengthens.
Cardiac muscle is the type of muscle that powers the cardiovascular system. It is a specialized type of muscle found only in the heart and is responsible for pumping blood throughout the body. This muscle type contracts involuntarily to help maintain circulation and supply oxygen and nutrients to tissues.
When one muscle in a pair contracts the other expands.