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Rigor mortis, or postmortem rigidity, is the third stage of death. It is characterized by stiffening of the limbs of the corpse caused by chemical changes in the muscles postmortem (mainly calcium).

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Automaticity is the ability of the heart muscle cells to generate an electrical impulse. Simultaneous activation of the whole cardiac muscle cells is achieved primarily by the conduction of action potentials from one cell to the next.

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Excitability is the ability of a muscle to respond to stimuli via generation of an electric pulse, which causes contraction of muscle cells. Skeletal muscles are excitable muscles.

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Elasticity is the ability of muscle to recoil and return to its original state. For example, a rubber band being stretched will still return to its original state.

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Extensibility is the ability to be stretched. The muscle relaxing or extending is the antagonist.

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When muscle contracts only one bone moves while the other is stationary. The muscle contracting is called the agonist.

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Calcium plays  crucial role in muscle contraction. Calcium facilitates the interaction between actin and myosin during contractions.  Calcium binds to the troponin, causing a position change in tropomyosin, exposing the actin sites that myosin will attach to for a muscle contraction.

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Myosin is a fibrous globulin of muscle that can split ATP. Myosin also reacts with actin in muscle contraction to form actomyosin.

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Actin is a muscle protein localized in the I band of the myofibrils. Actin is also responsible for contraction and relaxation of muscle.

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A suggested mechanism of contraction of striated muscles, actin and myosin filaments to be precise, which overlap each other resulting in the shortening of the muscle fibre length.

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Skeletal muscles are mostly attached by tendons to bones of the skeleton. The muscle cells of skeletal muscles are much longer than in the other types of muscle tissue, and are often known as muscle fibers.

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Involuntary, striated muscle that constitutes the main tissue of the wall of the heart. The cardiac muscle forms a thick middle layer between the outer layer of the heart wall and the inner layer.

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Muscle tissue in which the contractile fibrils are not highly ordered. They occur in the gut and other internal organs and not under voluntary control.

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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 a serious disease of the nervous system caused by a toxin-producing bacterium.  The disease causes muscle contractions, particularly of your jaw and neck muscles and is commonly known as lockjaw.

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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. Muscles hold the body erect and generte body heat
2. The muscular system makes movement possible.
3. The muscular system moves food through the digestive system.
4. Muscle movement aids the flow of blood
5. Muscle actions move fluid through the ducts and tubes associated with other body systems.

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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. Menstrual cramps are a example of muscle spasm.

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Muscle fatigue is the decline in ability of muscles to generate force. It can be a result of vigorous exercise but abnormal fatigue may be caused by barriers to or interference with the different stages of muscle contraction.

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Fascia is a layer of fibrous connective tissue that surrounds muscles, blood vessels and nerves. Fascia separates muscles and other internal organs.

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Tendons connect muscle to bone. Tendons are dense fibrous connective tissue.