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Rigor mortis is the stiffening of the muscles and joints after death. This is caused as the body is still temporarily "alive" while the brain is dead. This usually lasts from one to four days.

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Automaticity of muscle is the ability to contract involuntarily. This especially happens when we need to perform an action that isn't voluntary of our muscles. This includes the pumping of the heart.

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This is the ability to respond to stimulus. An example being if you squish your fingers in a door, you try to jerk back. This response allows us to attempt to get out of situations that put stress on the muscles.

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Elasticity is the ability to stretch and recoil your muscles. Muscles can move like this to prevent tears. If muscles were not like this, they would tear every time they were stretched.

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This is the ability of the muscle to extend. This is also, more commonly known, as stretching. An example is extending your elbow.

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Contractility is where the muscles contract. This is the act of moving muscles. It is caused by your muscles moving and tensing.

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Calcium is a mineral that helps the entire body, including the muscular system. In the muscular system, it aids with movement. When a muscle is about to contract, calcium is released into the muscle cells, allowing for them to move.

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Myosin is is a microfilament made in muscle. While paired with acting, it allows for muscle movement. While working alone, it helps with cell movement as well.

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Actin is a microfilament made of protein that help muscles contract and move. They do not act alone; they work in pair with mysosin. When paired together, they allow for full movement of the muscle.

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The sliding filament theory is how we believe muscles work. It's the theory that to create movement, layers of muscle tissue slide past each other. There are thick layers that slide past thin layers, while they remain at constant length.

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Skeletal muscle is the muscle around bone that is attached by tendons. This compared to the other muscle types, is a voluntary muscle. We can control these muscles since they attach to bone, allowing for mobility.

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Clonic spasms are muscular contractions. This causes rapid jerks of the muscles its affecting. When paired with tonic, it causes a grand mal seizures.

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Cardiac muscle is the muscle around the heart. This is involuntary because we can't control the speed or way it moves. It helps pump blood throughout the body

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Smooth muscle is located around internal organs. It is involuntary because we can not control what movements it makes. This can aid in things such as movement of food down the esophagus.

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Tetany is a case of muscle spasms, commonly in the hands and feet. The most common cause is mineral deficiency. These normally include magnesium and potassium deficiency.

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Tetanus is a bacterial infection in the muscles. This causes muscle spasms and can eventually lead to death.
There are very few cases, seeing as this can be prevented by vaccines.

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A tonic is a muscle contraction. This is involuntary and causes the muscles to stiffen up. This can happen normally, or more often depending on certain disorders, such as epilepsy.

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A spasm is a sudden contraction of one or more muscles. This is something you can't control, it just happens. It can cause pain depending on where it is, or if the muscle the limb controls hits something

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Muscle fatigue is when there's a decline in the ability to use them. You get very weak, and it's hard for the muscles to perform their tasks. This can be caused by overworking or other, more deeper features

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The 5 main functions are:
1. Movement
2. Protection of internal organs
3. Regulate body temperature
4. To breathe
5. To pump blood

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A fascia is a flat band of tissue that encloses muscle. The purpose of this reduces muscular friction. This allows a safe space for nerves and blood vessels to pass through.

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A tendon is a fibrous tissue that connects muscle to bone. This is so they don't slide around. The connectivity allows for full use of the body.