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Rigor Mortis occurs when the muscles in the body stiffen after death due to biochemical changes that occur to the muscles. This is what people use to determine the time of death, though it can be affected by variables like temprature.

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Automaticity is the ability for muscles to do things without being told. It is often called "muscle memory", though muscle memory isn't completely automatic. The heart is an automatic muscle meaning you don't have to consciously tell it to pump.

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Excitability is the ability of muscles to respond to a stimuli such as hormones or motor neurons.

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Elasticity is the ability of a muscle to return to its original shape by relaxing.

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Extensibility is the ability of muscles to stretch/extend.

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Muscles can only pull and not shorten, but contractility relates to how a muscle can forcefully shorten by allowing muscles to pull on attachment points and shorten with force.

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Muscle spasms are also known as muscle cramps and occur when your muscles forcibly contract and can’t relax. Your muscles twitch and there is no way to completely prevent muscle spasms

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Calcium triggers muscle contractions in striated muscles.

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Myosin is a motor protein that work with actin in contracting muscles. They work as a motor to move the cell.

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In eukaryotic cells, actin is the most prominent protein and is necessary for muscle contraction (movement). Actin is like the tracks that myosin follows to move the cell.

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The Sliding filament theory of muscle explains how muscles contract. Muscles contract by muscle proteins sliding past each other to generate movement.

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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) The muscles hold the body erect.
2) make movement possible
3) move food through the digestive system
4) muscle actions move fluid through ducts and tubes associated with other body systems.
5) muscle movement aids flow of blood through veins and generate body heat.

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How your muscular system works - Emma Bryce

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Clonic spasms refer to alternating involuntary muscular contraction and relaxation in quick bursts. It usually doesn't last as long as a tonic spasm. Tonic spasms last longer and are rigid muscle contractions.

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Skeletal muscles are voluntary and are attached to a bone. They form distinct organs of muscle tissue, tendons and blood vessels to aid in movement. They are longer than the other 2 types of muscles and are often known as muscle fibers

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Cardiac muscles are heart muscles. They are involuntary, striated muscles that make up the make up the walls of your heart. Cardiac muscles keep your heart pumping.

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Smooth muscles are involuntary, non-striated, not branched and singly nucleated muscles. This means they have no sarcomeres.

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Tetany is a symptom that causes involuntary muscles to contract and can even change your brain. This condition is shown by intermittent muscle spasms. The main cause of tetany is normally calcium deficiency.

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Tetanus (aka lockjaw) is caused by a bacteria infection from the bacteria Clostridium tetani. It produces toxins that cause muscle contractions.

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Muscle fatigue is a state of muscle exhaustion after a strenuous activity. It decreases your muscles' ability to perform overtime.

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The facia is a band of thin connective tissue that surrounds every organ, blood vessel, bone, muscle nerve fibers in place.

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A tendon is a cord of flexible tissue that connects your muscles to your bone. Tendons also protect your muscles by absorbing some shock from activities like jumping and running.