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Rigor mortis is a postmortem change resulting in the stiffening of the body muscles 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 after death.

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Automaticity is the property of cardiac cells to generate spontaneous action potentials. It is the ability to spontaneously depolarize and generate an action potential.

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Excitability is the ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone.
Excitability allows a muscle to respond to a stimulus and to maintain chemical potentials across its cell membranes.

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With elasticity, a muscle is able to return to its original resting shape and length after being extended or contracted. Activities that develop elastic strength for running are hopping, bounding and jumping.

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Extensibility is the ability of a muscle to be stretched.  Tissue extensibility relates to tissue flexibility, which is related to the strength and power that your muscles are able to generate. If you have healthy, extensible, flexible muscle, you are going to be able to perform much better than if your muscles are scarred down, hard, and inflexible.

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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 helps regulate muscle contraction. When a nerve stimulates a muscle, the body releases calcium which helps the proteins in muscle carry out the work of contraction. When the body pumps the calcium out of the muscle, the muscle will relax.

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Myosin is a protein that converts chemical energy in the form of ATP to mechanical energy. It is the molecular motor that transduces energy from the hydrolysis of ATP into directed movement and that, by doing so, drives sarcomere shortening and muscle contraction.

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Actin is a protein that is an important contributor to the contractile property of muscle and other cells.  Actin is  proteins are important for cell movement and the tensing of muscle fibers.

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The theory explains the mechanism of muscle contraction based on muscle proteins that slide past each other to generate movement. The sliding filament theory is a widely accepted explanation of the mechanism that underlies muscle contraction.

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Skeletal muscles are voluntary and attach to the bones to make movement possible. Skeletal muscles have striated, tubular, and multinucleated fibers.

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Cardiac muscles are involuntary. Cardiac muscles are striated, tubular, and branched and have uninucleated fibers. Cardiac muscle forms muscular walls of the heart.

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Smooth muscles are involuntary muscles. Smooth muscles have narrow, tapered rod-shaped cells and have non-striated, uninucleated fibers. This muscle is located in the walls of internal organs.

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Tetany is a symptom characterized by the involuntary contraction of muscles that usually results from low calcium levels in the blood. Some common symptoms of tetany are numbness around the mouth and muscle cramps.

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A tetanus is an infection caused by bacteria. When the bacteria invades the body, a poison (toxin)  causes painful muscle contractions. Another name for tetanus is “lockjaw” which often causes a person's neck and jaw muscles to lock, making it hard to open the mouth or swallow.

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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 muscle spasm, or muscle cramp, is an involuntary contraction of a muscle. Muscle spasms occur suddenly, usually resolve quickly, and are often painful.

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Muscle fatigue is a decrease in maximal force or power production in response to contractile activity. The two types of muscle fatigue are central (neural) and peripheral (muscular).

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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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The functions of the muscular system include muscles holding the body erect, making movement possible, moving food through the digestive system, muscle movement aiding the flow of blood through veins, and muscle action moving fluid throughout ducts/tubes associated with other body systems. The muscular system also generates body heat.

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Fascia is a thin casing of connective tissue. It surrounds and holds every organ, blood vessel, bone, nerve fiber and muscle in place.

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A tendon is a fibrous connective tissue that attaches muscle to bone. A tendon serves to move the bone or structure.