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The ability to spontaneously depolarize. Also to generate an action potential.

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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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Extensibility is the ability of a muscle to be stretched. For instance, let's reconsider our elbow flexing motion we discussed earlier. In order to be able to flex the elbow, the elbow extensor muscles must extend in order to allow flexion to occur. Lack of extensibility is known as spasticity.

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Excitability is the ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone. Extensibility is the ability of a muscle to be stretched or extended. Elasticity is the ability to a muscle to return to its original length when relaxed.

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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. Tissues often become restrictive and inelastic resulting in an increase in muscle tightness and pain.

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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. Muscles can only pull, never push. Excitability is the ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone.

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Calcium is a mineral that is necessary for life. In addition to building bones and keeping them healthy, calcium enables our blood to clot, our muscles to contract, and our heart to beat. About 99% of the calcium in our bodies is in our bones and teeth.

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Myosin is a family of motor proteins that, together with actin proteins. They form the basis for the contraction of muscle fibers.

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Actin is a group of globular proteins that are the most abundant proteins in most eukaryotic cells and help in providing shape, structure, and mobility to the body.

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The sliding filament 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 muscle is a voluntary muscle, which means that we can actively control its function. It's attached to the bone and forms a distinct organ of muscle tissue, blood vessels, tendons, and nerves that covers our bones and allows movement.

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Cardiac muscle/heart muscle is one of three types of vertebrate muscle tissue, with the other two being skeletal muscle and smooth muscle. It is involuntary, striated muscle that constitutes the main tissue of the wall of the heart.

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Smooth muscle is an involuntary non-striated muscle, so-called because it has no sarcomeres and therefore no striations. It is divided into two subgroups, single-unit and multiunit smooth muscle. Within single-unit muscle, the whole bundle or sheet of smooth muscle cells contracts as a syncytium.

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A condition of physiological calcium imbalance marked by tonic spasm of muscles and often associated with deficient parathyroid secretion.

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A tendon is a fibrous connective tissue that attaches muscle to bone. Tendons may also attach muscles to structures such as the eyeball. A tendon serves to move the bone or structure.

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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. Another name for tetanus is “lockjaw”. 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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Tonic and clonic seizures affect the muscles. Tonic seizures cause a stiffening of muscles. Clonic seizures are characterized by jerking or twitching.

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An involuntary and abnormal muscular contraction; sudden violent and temporary effort, emotion, or sensation a spasm of creativity spasms of pain.

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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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5 Basic Functions of the Muscular System

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5 Basic Functions of the Muscular System

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The muscular system's main function is to allow movement.

Stability; Muscle tendons stretch over joints and contribute to joint stability.

Posture;  Maintains back shape and posture.

Circulation; Provides oxygen

Respiration; Oxygen goes in and out.

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