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The muscle contracts when the myosin shifts, but the lack of ATP prevents it from detaching, and the muscle remains contracted. Such a process occurs in all muscles as the body becomes rigid. Rigor mortis usually sets in within four hours, first in the face and generally smaller muscles.

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The heart automaticity is a fundamental physiological function in higher organisms. The spontaneous activity is initiated by specialized populations of cardiac cells generating periodical electrical oscillations. The exact cascade of steps initiating the pacemaker cycle in automatic cells has not yet been entirely elucidated.

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Excitability is the ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone. For a muscle to contract and do work, its cells must be stimulated, most often by the nerves supplying them.  If the membrane becomes sufficiently depolarized, an action potential results; the muscle cell is then "excited" from an electrochemical standpoint.

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Elasticity is the ability to recoil or bounce back to the muscle's original length after being stretched. Ligaments are slightly elastic, so they can be stretched and gradually lengthen, increasing flexibility. When the limb of your body is moved in any way in any direction for any purpose, muscles and tendons accommodate by elongating or shortening at various key spots.

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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. Lack of extensibility is known as spasticity.

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Contractility is the ability of muscle cells to forcefully shorten. For instance, in order to flex your elbow you need to contract the biceps brachii. Notice that in order to extend your elbow, the posterior arm extensor muscles need to contract. Thus, muscles can only pull, never push.

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Upon nervous system excitation for a contraction, calcium is released into the fiber.  The 1% of calcium that is not located in our bones or teeth is found in our blood, muscles and in the fluid between cells. Calcium triggers contraction by reaction with regulatory proteins that in the absence of calcium prevent interaction of actin and myosin.

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Myosin is a special protein that converts adenosine triphosphate (ATP) into mechanical energy. Some myosins are involved in muscle contraction. These myosins interact with other myosin proteins, forming thick filaments.

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Actin is the most abundant protein in most eukaryotic cells. Moreover, the interaction of filamentous actin with myosin forms the basis of muscle contraction. Owing to its central role in the cell, the actin cytoskeleton is also disrupted or taken over by numerous pathogens.

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The sliding filament theory is the explanation for how muscles contract to produce force.

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Skeletal muscle is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. The skeletal muscles allow the body to move.

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Cardiac muscle is also an involuntary muscle, found only in the heart. Cardiac muscles control the contraction and relaxation of the heart. The cardiac muscle has one job, and it is to pump blood through the blood vessels in the body.

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Smooth muscle is also sometimes known as Involuntary muscle due to our inability to control its movements.  Smooth muscle determines the flow of blood in the arteries. Smooth muscle tissue tends to demonstrate greater elasticity

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Tetany can be the result of an electrolyte imbalance. Tetany can also be caused by magnesium deficiency or too little potassium.  Some of the symptoms of low blood calcium are muscles cramps or spasms in your legs, feet, lower back, or face.

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The bacteria that cause tetanus can be found in soil, manure, or dust. Common signs of tetanus include spasms and stiffness in your jaw muscles. If tetanus does develop, seek hospital treatment immediately.

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Tonic spasms are rigid muscle contractions that last a period of time. During the tonic phase a person initially stiffens and loses consciousness, causing them to fall to the ground.

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Clonic spasms refer to alternating involuntary muscular contraction and relaxation in quick succession. Clonic seizures involve rhythmic twitching or jerking of one or several muscles. Clonic seizures could be caused by a brain tumor or a ruptured blood vessel in the brain.

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A muscle spasm is usually a sprain or a strain. It is an involuntary sustained cramping or tightening of the muscle fibers. Muscle related causes are the most common reason for back pain.

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Muscle fatigue is the decline in ability of a muscle to generate force. Muscle fatigue can occur anywhere on the body. An initial sign of this condition is muscle weakness. Other symptoms associated with muscle fatigue include: soreness.

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3. 5 basic functions of the Muscular System

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3. 5 basic functions of the Muscular System

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The muscular system creates movement

It protects the organs

The cardiac muscle pumps blood

Smooth muscle aids digestion

Smooth muscle ensures blood flow

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The superficial fascia is a soft connective tissue that is located just below the skin. It wraps and connects the muscles, bones, nerves, and blood vessels of the body. Together, muscle and fascia make up what is called the myofascia system.

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Tendon is a highly organized connective tissue joining muscle to bone. Tendons may also attach muscles to structures such as the eyeball. A tendon serves to move the bone or structure.