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Rigor mortis is a postmortem, death, change resulting in stiffness of the body muscles.

This occurs between 1 and 6 hours of death with the average being 2-4, this time has been used to determine time of death.

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The ability to perform a task by automatic processing, independent of conscious control and attention.

An example of this could be moving your skeletal muscle to catch a ball, your automatic processing would cause the acknowledgment of the ball, while the attention and conscious control allows you to catch it.

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Excitability is the ability to respond to a stimulus, this reaction can be delivered by a neuron or a hormone.

One of the tests used to find out excitability would be an EMG; Electromyography.

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Muscle tissue elasticity is the ability to stretch muscle to reach its full range of movement without restriction with the main source of this being titin; A single one consists of a long chain of folded bundles.

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Extensibility of muscle is the ability of the cells to be stretched, this is heavily related to stretch and power muscles to generate

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Muscle cells being fibrous allow them to forcefully shorten pulling on attachment points such as tendons allowing movement of skeletal muscle; voluntary muscle.

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Calcium is very important for body as it is necessary for muscle contraction because it is needed by two proteins, troponin and tropomyosin, that regulate muscle contraction by blocking the binding of myosin to filamentous actin.

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Known as a motor protein myosin can convert chemical energy, more specifically ATP, into mechanical energy generating force and movement.

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Actin is a protein that forms with and passes by myosin for muscle movement/contraction.

Its also very important for many processes with cells such as motility, division, and cytokinesis.

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The Sliding Filament Theory of Muscle explains how muscle contraction works.

The theory states that myosin and actin connect and slide past each other generating movement.

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Tetany is a condition that causes muscle cramps, paresthesia, and numbness; Particularly around the mouth.

Severe condition could lead to difficulty breathing, seizures, and decreased cardiac functions.

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Tetanus is a bacterial infection that causes muscle spasms, stiffness, and tension of muscles.

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A tonic spasm is brief, often painful, unilateral muscle contractions lasting for thirty seconds to three minutes

A clonic muscle spasm is sustained rhythmical contractions lasting for a minute to three minutes.

The main difference between them is how tonic is related to stiffness of muscles and clonic to twitching/jerking.

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A spasm is a sudden involuntary contraction of muscle

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Muscle fatigue is a symptom where muscles perform worse overtime, this can be caused by a number of things such as age.

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1. Muscles hold the body erect allowing us to keep shape and structure.

2. Move movement possible

3. Move food through the digestive system with smooth muscle.

4. Muscle movements aids the flow of blood through the veins.

5. Muscle actions move fluid through the ducks and tubes associated with other body systems.

6. Also generates body heat keeping us warm.

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Tendons are composed of dense fibrous connective tissue that connect muscles to bone thus allowing movement.

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A fascia is a sheet of flexible connective tissue that covers, supports, and separates muscles or groups of muscle.

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Involuntary tubular branched fibers that works the heart.

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Smooth muscle is an involuntary narrow red piece of muscle found in the walls of internal organs.

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Voluntary muscles that are long and tube like in appearance.
Attached to bone and gives movement to the body.