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Rigor mortis is the postmortem change resulting in the stiffening of the body due to chemical changes in their myofibrils. Rigor mortis helps in estimating the time since death as well to ascertain if the body had been moved before death.

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Automaticity is the ability to perform a task by automatic processing. This is done in the heart muscle which allows it to pump without command.

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Excitability is the ability to receive and respond to stimuli. Muscles do this via generation of an electrical pulse which causes contraction of the muscle cells.

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Elasticity is the ability of a muscle fiber to recoil and resume its resting length. This is essential for movement.

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Extensibility is the ability of muscle to be stretched. The extensibility allows for movement.

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Contractility is the ability of muscle cells to forcefully shorten. Contractility allows muscle tissue to pull on its attachment points and shorten with force.

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Calcium is important to the transmission of nerve impulses to the muscle fiber. Calcium facilitates the interaction between actin and myosin during contractions.

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Myosins are a superfamily of motor proteins best known for their roles in muscle contraction. They are ATP-dependent and responsible for actin-based mobility.

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Actin is a protein that forms the filaments of muscle cells. It is also involved with the motion in other types of cells.

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The sliding filament theory explains the mechanism of muscle contraction. It is thought that muscle proteins slide against each other to generate movement.

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Skeletal muscles are voluntary muscles. They have a striated appearance.

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Cardiac muscles are involuntary and found only in the heart. Their appearance is striated.

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Smooth muscles are involuntary. They show no cross stripes under a miscroscopic magnification.

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Tetany causes involuntary muscle contractions and changes in your brain cells. Tetany is caused by a dramatically low calcium level.

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Tetanus is an infecton caused by the Clostridium tetani bacteria. When the bacteria invade the body, they produce a toxin that causes painful muscle contractions.

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Clonic muscle spasms are alternating involuntary muscular contraction and relaxation in quick succession. Tonic muscle spasms are brief painful unilateral muscle contractions lasting 30 seconds- 3 minutes.

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Involuntary contractions of the muscle which are typically harmless and temporary, but they can be painful. Causes can be overexertion, not using the muscle enough, and low magnesium or potassium.

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Muscle fatigue is a symptom that decreases the muscles' ability to perform over time. Muscle fatigue can be associated with strenuous activities.

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5 basic functions of the muscular system

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5 basic functions of the muscular system

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Muscles hold the body erect and make movement possible. Muscles help move food through the digestive system, and their movement aids in the flow of blood through veins. Muscle actions move fluid through the ducts and tubes associated with other body systems.

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Fascia is a sheet of fibrous connective tissue. It covers, supports, and separates muscles.

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A tendon is a band of non elastic, dense, fibrous connective tissue. It attaches muscle to bone which allows movement.