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Rigor mortis is the reason why the word "stiff" is a slang term for a dead body. Two or three hours after a person or animal dies, the muscles start to stiffen. This phenomenon progresses in a downward, head-to-toe direction. In 12 to 18 hours the body is, as the saying goes, stiff as a board. At this stage, you can move the joints only by force, breaking them in the process.

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the ability of a cell to depolarize itself, reach threshold potential, and produce a propagated action potential; cells with this capability are called automatic cells.

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Excitability is the ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone.

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Extensibility is the ability of a muscle to be stretched

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the ability of muscle cells to forcefully shorten

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he muscle thereby creates force, and shortens. After the action potential has passed, the calcium gates close, and calcium pumps located on the sarcoplasmic reticulum remove calcium from the cytoplasm. As the calcium gets pumped back into the sarcoplasmic reticulum, calcium ions come off the troponin.

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a fibrous protein that forms (together with actin) the contractile filaments of muscle cells and is also involved in motion in other types of cells.

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a protein that forms (together with myosin) the contractile filaments of muscle cells, and is also involved in motion in other types of cells.

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muscle contraction based on muscle proteins that slide past each other to generate movement.

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Skeletal muscle is one of three major muscle types, the others being cardiac muscle and smooth muscle. It is a form of striated muscle tissue which is under the voluntary control

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muscle of the heart. ; Cardiac muscle is also an involuntary muscle

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muscle tissue in which the contractile fibrils are not highly ordered, occurring in the gut and other internal organs and not under voluntary control.

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a condition marked by intermittent muscular spasms, caused by malfunction of the parathyroid glands and a consequent deficiency of calcium.

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lockjaw ; A serious bacterial infection that causes painful muscle spasms and can lead to death.

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Clonic spasms refer to alternating involuntary muscular contraction and relaxation in quick succession. Tonic spasms are rigid muscle contractions that last a period of time.

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a sudden involuntary muscular contraction or convulsive movement.

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decline in ability of a muscle to generate force

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The muscular system creates movement. The primary function of muscular system is to produce voluntary gross and fine movements. ...

It protects the organs.

The cardiac muscle pumps blood. ...

Smooth muscle aids digestion. ...

Smooth muscle ensures blood flow.

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a thin sheath of fibrous tissue enclosing a muscle or other organ.

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a flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.