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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. It helps in estimating the time since death as well as to ascertain if the body had been moved after death.

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Automaticity of muscle is the ability to spontaneously depolarize and generate an action potential. It refers to a cardiac muscle cell firing an impulse on its own.

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Excitablility is the ability to receive and respond to stimuli via generation of an electrical pulse which causes contraction of the muscle cells. The stimulus may be delivered from a motor neuron or a hormone.

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Elasticity is the ability of a muscle fiber to recoil and resume is resting length. When the limb of you body is moved in any way in any direction for any purpose, muscles and tendons accommodate by elongating or shortening at various key points, so everything goes right back to its shape and form, and place when we move our limbs back to where the movement had started.

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Extensibility is the ability to be stretched or extended. For instance, in order to be able to flex the elbow, the elbow extensor muscles must extend in order to allow flexion to occur.

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Contractility is the ability to shorten. It allows muscle tissue to pull on its attachment points and shorten with force.

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

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Actin is a family of globular multi-functional proteins that form microfilaments in the cytoskeleton, and the thin filaments in muscle fibrils. It is found in essentially all eukaryotic cells.

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

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Skeletal muscle attaches to the bones and makes body motions possible. They are voluntary muscles that appear striated, tubular, and have multinucleated fibers.

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Cardiac muscle forms the muscular walls of the heart. They are involuntary muscles that appear striated, tubular, branched, and have uninucleated fibers.

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Smooth muscle is located in the walls of internal organs. They are involuntary muscles that are narrow, tapered rod-shaped cells. Some examples include the digestive tract, blood vessels, and ducts leading to glands.

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Tetany is a medical sign consisting of the involuntary contraction of muscles, which may be caused by disorders that increase the action potential frequency of muscle cells of the nerves that innervate them. Muscle cramps caused by the disease tetanus are not classified as tetany. Rather, they are due to a lack of inhibition to the neurons that supply muscles.

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Tetanus is a serious bacterial infection that causes painful muscle spasms and can lead to death. It is a potentially fatal bacterial infection that affects the nerves. A vaccine can easily prevent the infection, which has no cure.

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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 spasm is a sudden, violent, involuntary contraction of one or more muscles. They can have causes that aren't due to underlying disease. Examples include extreme fatigue from overexertion, not using the muscle enough, low magnesium, or low potassium.

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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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Muscles hold the body erect, make movement possible, move food through the digestive system, and generates body heat. In addition, muscle movement aids the flow of blood through veins, and muscle actions move fluid through the ducts and tube associated with other body systems.

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Fascia are sheets of fibrous connective tissue that cover, support, and separate muscles or groups of muscles. They are flexible to allow for movement.

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Tendons are narrow bands of nonelastic, dense, fibrous connective tissue that attach a muscle to a bone. It is able to efficiently transmit the mechanical forces of muscle contraction to the skeletal system without sacrificing its ability to withstand significant amounts of tension.