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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: the ability to spontaneously depolarize and generate an action potential. Used when a heart beats automatically.

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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.

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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.

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Extensibility is the ability of a muscle to be stretched. 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 of muscle cells to forcefully shorten. Contractility allows muscle tissue to pull on its attachment points and shorten with force.

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Calcium facilitates the interaction between actin and myosin during contractions. Calcium is required by two proteins, troponin, and tropomyosin, that regulate muscle contraction by blocking the binding of myosin to filamentous actin.

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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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A protein that forms (together with myosin) the contractile filaments of muscle cells, and is also involved in motion in other types of cell. Actin participates in many important cellular processes, including muscle contraction, cell motility, cell division, and cytokinesis.

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The sliding filament theory describes the mechanism that 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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Attaches to the bones and makes body motion possible. Are voluntary muscles

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Form the muscular walls of the heart. Are involuntary muscles

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Located in the walls of internal organs. Ex. digestive tract, blood vessels, ducts leading to glands. Are involuntary muscles

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a condition marked by intermittent muscular spasms, caused by malfunction of the parathyroid glands and a consequent deficiency of calcium. Tetany can be the result of an electrolyte imbalance.

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A serious bacterial infection that causes painful muscle spasms and can lead to death. Tetanus is a potentially fatal bacterial infection that affects the nerves.

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Clonic Spasms. These are spasms in which contraction and relaxation of the muscle alternate. Tonic Spasms.  They are characterized by brief, stereotyped often painful unilateral muscle contractions lasting 30 seconds - 3 minutes

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A sudden, violent, involuntary contraction of one or more muscles. Similar to a cramp or twist

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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.

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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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1. muscles hold the body erect
2. make movement possible
3. Move food through the digestive system
4. muscle movement aids the flow of blood through veins
5. Muscle actions moves fluid through the ducts and tubes associated with other body systems

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A narrow band of nonelastic, dense, fibrous connective tissue that attaches a muscle to a bone. Allows for muscles to move bones allowing for movement

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Sheet of fibrous connective tissue that covers, supports, and separates muscle or groups of muscles. Flexible to allow movement