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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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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 ability to perform a task by automatic processing, independent of conscious control and attention. So, for muscles it's power of the heart muscles to contract independently of each other when separated or in unison when reattached in whole or in groups.

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In a muscle fiber, the inducibility to contract. This is a function of the chemical and electrical state of the sarcolemma and the time since a previous stimulus was applied.

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Tissue elasticity is the ability to stretch a muscle to reach its full range of movement without restriction. By influencing the speed of contractile elements, elastic structures can have a profound effect on muscle force, power and work. In very rapid movements, elastic mechanisms can amplify muscle power by storing the work of muscle contraction slowly and releasing it rapidly.

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Extensibility is the ability of a muscle to be stretched. For instance, let's consider our elbow flexing motion. 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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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.)

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Calcium's positive molecule is important to the transmission of nerve impulses to the muscle fiber via its neurotransmitter triggering release at the junction between the nerves. Inside the muscle, calcium facilitates the interaction between actin and myosin during contractions.

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Myosin is a fibrous protein that forms (together with actin) the contractile filaments of muscle cells. It is also involved in motion in other types of cells.

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It is a protein that forms (together with myosin) the contractile filaments of muscle cells. It is also involved in motion in other types of cells

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The sliding filament theory describes the mechanism allows muscles to contract. According to this theory, myosin (a motor protein) 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 are the most common of the three types of muscle in the body. Skeletal muscles are attached to bone by tendons, and they produce all the movements of body parts in relation to each other.

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Cardiac muscle tissue, or myocardium, 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, also called involuntary muscle , is a muscle that shows no cross stripes under microscopic magnification. Smooth muscle tissue, unlike striated muscle, contracts slowly and automatically. It constitutes much of the musculature of internal organs and the digestive system.

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Tetany is a symptom characterized by the involuntary contraction of muscles that leads to painful muscle cramps, spasms of the voice box (i.e., larynx), and sensory disturbances. It is most commonly associated with low blood calcium levels, or hypocalcemia, although it can also appear with other metabolic irregularities.

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A tough cord or band of dense white fibrous connective tissue that unites a muscle with some other part (such as a bone). Also, it transmits the force which the muscle exerts.

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Tetanus is a serious illness caused by Clostridium bacteria. The bacteria live in soil, saliva, dust, and manure. The bacteria can enter the body through a deep cut, like those you might get from stepping on a nail, or through a burn.
The infection causes painful tightening of the muscles, usually all over the body, and can lead to "locking" of the jaw.

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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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Muscle spasms (muscle cramps) are painful contractions and tightening of your muscles. They’re common, involuntary and unpredictable. Although there are steps you can take to prevent a muscle spasm and treat it when it attacks, those methods are not always reliable. Muscle relaxants, stretching and massage are most likely to help.

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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 main function of the muscular system is movement, but it also helps stabilize our joints, maintain our posture and generate heat during activity. The muscular system also aids in digestion.

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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. The tissue does more than provide internal structure; fascia has nerves that make it almost as sensitive as skin.