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Rigor mortis, the third stage of death, is one of the recognizable signs of death, caused by chemical changes in the muscles post mortem, which cause the limbs of the corpse to stiffen.

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The resting potential of sinus node cells is -50 to – 60 mV, for ventricular musclecells it is -80 to – 90 mV. Cardiac cells endowed with automaticity depolarize spontaneously at a rate commensurate with the intrinsic rate of the cell.

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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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Elasticity means that if muscles are stretched, they recoil to their original resting length.

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Extensibility means that muscles can be stretched to their normal resting length and beyond to a limited degree.

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Once innervated, the protein filaments within each skeletal muscle fiber slide past each other to produce a contraction, which is explained by the sliding filament theory.

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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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Myosins comprise a superfamily of ATP-dependent motor proteins and are best known for their role in muscle contraction and their involvement in a wide range of other motility processes in eukaryotes. They are responsible for actin-based motility.

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Actin is a family of globular multi-functional proteins that form microfilaments. It is found in essentially all eukaryotic cells, where it may be present at a concentration of over 100 μM

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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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Skeletal muscle is one of three major muscle types, the others being cardiac muscle and smooth muscle. It is a form of striated muscle tissue which is under the 'voluntary' control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons.

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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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Smooth muscle is an involuntary non-striated muscle. It is divided into two subgroups; the single-unit (unitary) and multiunit smooth muscle. Within single-unit cells, the whole bundle or sheet contracts as a syncytium.

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

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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: atonic reflex. b. Medicine Characterized by continuous tension or contraction of muscles: a tonic convulsion or spasm.

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Clonic means sustained rhythmical jerking. During a clonic seizure, jerking of the body or parts of the body are the main symptom. They can begin in one area (called focal motor) or affect both sides of the brain (called generalized clonic). Clonic seizure movements cannot be stopped by restraining the person.

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A spasm is a sudden involuntary contraction of a muscle, a group of muscles, or a hollow organ such as the heart. A spasmodic muscle contraction may be caused by many medical conditions, including dystonia. Most commonly, it is a muscle cramp which is accompanied by a sudden burst of 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 musclecontraction.

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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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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 a fibrous connective tissue that is present throughout the entire body, not just the muscles. There are three main types of fascia: Superficial Fascia, which is mostly associated with the skin; Deep Fascia, which is mostly associated with the muscles, bones, nerves and blood vessels; and.

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a flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.Tendons are similar to ligaments; both are made of collagen. Ligaments join one bone to another bone, while tendons connect muscle to bone.