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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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The ability to spontaneously depolarize and generate an action potential. A reflex.

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

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Tissue elasticity is the ability to stretch a muscle to reach its full range of movement without restriction. Different types of tissues can be found within the body including soft tissues and connective tissues

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

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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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In muscle contraction, calcium ions play an important role by building interactions between proteins, myosin and actin. The Ca2+ ions bind to the C portion of the actin filament, exposing the binding region to which the myosin head is attached to stimulated muscle contraction.

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Myosins are motor proteins that interact with actin filaments and couple hydrolysis of ATP to conformational. This changes the result in the movement of myosin and an actin filament relative to each other.

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Actin is a cellular protein found especially in microfilaments. They are  active in muscular contraction, cellular movement, and maintenance of cell shape

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The sliding filament theory describes the mechanism that allows muscles to contract. According to this theory, myosin binds to actin. The myosin then alters its configuration, resulting in a "stroke" that pulls on the actin filament and causes it to slide across the myosin filament.

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Skeletal muscle, also called voluntary muscle, in vertebrates, most common of the three types of muscle in the body. Skeletal muscles are attached to bones by tendons, and they produce all the movements of body parts in relation to each other. Unlike smooth muscle and cardiac muscle, skeletal muscle is under voluntary control.

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Cardiac muscle tissue is a specialized type of muscle tissue that forms the heart. This muscle tissue, which contracts and releases involuntarily, is responsible for keeping the heart pumping blood around the body.

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

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

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Tetanus is an infection caused by bacteria called Clostridium tetani. When the bacteria invade the body, they produce a poison (toxin) that causes painful muscle contractions. It often causes a person's neck and jaw muscles to lock, making it hard to open the mouth or swallow.

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A clonic muscle spasm is a series of alternating muscular contractions and relaxations. A tonic muscle spasm consists of a continued muscular contraction.

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Muscle spasms are painful contractions and tightening of your muscles. They’re common, involuntary and unpredictable. These spasms typically occur in the calves and feet.

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Muscle fatigue is a symptom that decreases your muscles' ability to perform over time. It can be associated with a state of exhaustion, often following strenuous activity or exercise. When you experience fatigue, the force behind your muscles' movements decrease, causing you to feel weaker.

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Movement

Skeletal muscles pull on the bones causing movements at the joints.

Support

Muscles of the body wall support the internal organs.

Protection

Skeletal muscles cushion the body's internal organs from force applied to the exterior of the body.

Heat generation

Shivering is a mechanism of the muscular system that generates heat to warm an overly cooled body.

Blood circulation

Cardiac muscles aid pumping action of the heart by aiding blood circulation.

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

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The tendon is a flexible but inelastic cord. This cord is composed of strong fibrous collagen tissue. Tendons attach a muscle to a bone.