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Contractility refers to the capacity of muscle to contract or shorten forcefully. Excitability means that muscle responds to stimulation by nerves and hormones, making it possible for the nervous system and, in some muscle types, the endocrine system, to regulate muscle activity.

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When the brain signals the muscle to contract, the body pulls calcium from the blood into the muscle cells. The calcium binds with the troponin and draws it out of position. ... When the troponin and tropomyosin move, this activates the actin and myosin to move toward each other and contract the muscle.

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A protein found in muscle tissue as a thick filament made up of an aggregate of similar proteins. Myosin and the protein actin form the contractile units (sarcomeres) of skeletal muscle. In the sarcomere, actin and myosin filaments slide past each other to cause the shortening of a muscle fiber.

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A protein found in all eukaryotic cells, forming filaments that make up a main component of the cell's supporting matrix or cytoskeleton. Actin and the protein myosin together make up the contractile units (called sarcomeres) of skeletal muscle fibers.

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According to the sliding filament theory, the myosin (thick) filaments of muscle fibers slide past the actin (thin)filaments during muscle contraction, while the two groups of filaments remain at relatively constant length.

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Each skeletal muscle fiber is a single cylindrical muscle cell. An individual skeletal muscle may be made up of hundreds, or even thousands, of muscle fibers bundled together and wrapped in a connective tissue covering. Each muscle is surrounded by a connective tissue sheath called the epimysium.

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Cardiac muscle (heart muscle) is an involuntary, striated muscle that is found in the walls and histological foundation of the heart, specifically the myocardium. Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle.

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It consists of narrow spindle-shaped cells with a single, centrally located nucleus. Smooth muscle tissue, unlike striated muscle, contracts slowly and automatically. It constitutes much of the musculature of internal organs and the digestive system. The stomach is composed of smooth muscle cells.

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Tetany or tetany seizure is a medical sign consisting of the involuntary contraction of muscles, which may be caused by disease or other conditions that increase the action potential frequency of muscle cells or the nerves that innervate them.

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A tetanic contraction (also called tetanized state, tetanus, or physiologic tetanus, the latter to differentiate from the disease called tetanus) is a sustained muscle contraction evoked when the motor nerve that innervates a skeletal muscle emits action potentials at a very high rate.

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Physiology Of, relating to, or producing tone or tonicity in muscles or tissue: a tonic reflex. b. Medicine Characterized by continuous tension or contraction of muscles: a tonic convulsion or spasm.

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Alternate involuntary muscular contraction and relaxation in rapid succession. A continuous rhythmic reflex tremor initiated by the spinal cord below an area of spinal cord injury, set in motion by reflex testing.

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Muscle spasms are involuntary, spontaneous contractions of a muscle.This, in turn, sensitizes the nerves, causing the muscle/s to contract and spasm. Disc Disorders and Muscle Spasms. Conditions, such as degenerative disc disease or herniated disc, may cause an acute episode of low back pain.

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Muscle fatigue is the decline in ability of a muscle 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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5 basic functions of the muscular system 

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5 basic functions of the muscular system 

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Five Functions of the Muscular System. Skeletal muscles attach to your bones, stabilizing the skeleton and enabling voluntary and reflexive movement. Smooth muscle tissue found in blood vessels and various body organs produces involuntary movement essential for normal function.

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Fascia is internal connective tissue that wraps around organs, providing support and holding parts together. It has the appearance of a very thin spider web, connecting layers of muscle and surrounding all internal body tissues. A thin sheath of fibrous tissue enclosing a muscle or other organ.

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a flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.
the hamstring of a quadruped. You can easily tear your tendon by landing on your feet the wrong way.