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Rigor mortis is a postmortem change that results in the stiffening of body muscles due to chemical changes in the myofibrils.

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Automaticity of muscles is the ability to spontaneously depolarize and generate an action potential.

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Excitability of muscles is the ability of muscles to respond to stimuli via electrical pulses.

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Elasticity of muscles id the ability to recoil an muscle and have it return to its original position.

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Extensibility of muscles is the ability of muscle to extend.

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Contractility is the ability of muscles to shorten.

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Calcium facilitates the interaction between actin and myosin during contractions.

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Myosin is a superfamily of motor proteins that play a role in muscle contraction. They also work with actin to contractile the filament of the muscle cells.

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Actin is a protein that contractile filaments of muscle cells.

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This theory explains muscle movement based on sliding muscle proteins.

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Tetany is the rhythmic cramping of the muscles of the hands and feet, muscle twitching, and possible spasms of the larynx.

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

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

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Skeletal muscle is striated and has tubular uninucleated fibers. It attaches to bone for movement and is voluntary.

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Cardiac muscle has striated, tubular, branches, uninucleated fibers. It forms the muscular walls of the heart and is involuntary.

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Smooth muscle has narrow, tapered, rod shaped cells. It also has nonstriated, uninucleated fibers. It is located in the walls of internal organs and is involuntary.

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A sudden involuntary movement of muscle(s)

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Muscle fatigue is the decline in ability of muscles to generate force.

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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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1. holds body erect
2. makes movement possible
3. moves food through digestive system
4. aids in flow of blood through veins
5. muscle actions move fluids through duct and tubes associated with other body systems

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Fascia is a sheet of fibrous connective tissue that covers, supports, and separates muscles or groups of muscles, they are flexible and allow for movement.

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Tendons are a narrow band of non-elastic, dense, fibrous, connective tissue that attaches muscle to bone