# data[].attributes.body
Rigor mortis means stiffness of death in Latin. After you die, your muscles and joints become stiff/rigid as a result of chemical changes occurring in the muscles.

# data[].attributes.body
Automaticity is a cardiac muscle's ability to contract independently or in unison. They generate action potential spontaneously without any external stimulus.

# data[].attributes.body
Excitability is the muscle's ability to receive and respond to stimuli. A stimuli is the generation of an electric pulse, and it will cause contraction of the muscle cells.

# data[].attributes.body
Elasticity is the ability of muscle fiber to recoil and resume resting length. If there is decreased elasticity, muscles can become restrictive, causing muscle tightness and pain.

# data[].attributes.body
Extensibility is a muscle's ability to be stretched or extended. For example, to flex the elbow, the elbow extensor muscles must have extensibility.

# data[].attributes.body
Contractility is the muscle's ability to shorten. Contractility allows muscles to pull on its attachment points and and shorten with force because muscles can only pull.

# data[].attributes.body
Calcium is important for regulating the interaction between actin and myosin in muscles. It is released when neurons signal a muscle contraction.

# data[].attributes.body
Myosin is a superfamily of molecule-sized motor proteins that convert ATP to mechanical energy. They assist in muscle contraction and mobility.

# data[].attributes.body
Actin is a prominent and abundant protein important in many cellular processes. It helps support muscle contraction with myosin.

# data[].attributes.body
The sliding filament theory of muscle was developed to explain how muscles contract. Myosin and actin filaments slide across each other to produce muscle contraction.

# data[].attributes.body
Skeletal muscles are voluntary and attach to bone. They are striated and tubular with multinucleated fibers.

# data[].attributes.body
Cardiac muscles are involuntary and found in the walls of he heart. They are striated and tubular and have uninucleated ranched fibers.

# data[].attributes.body
Smooth muscles are involuntary and located in the walls of internal organs. They are narrow, tapered rod-shaped cells that are non-striated with uninucleated fibers.

# data[].attributes.body
Tetany is a condition where overly stimulated neuromuscular activity leads to involuntary muscle contractions or spasms. Most often it is caused by low calcium levels.

# data[].attributes.body
Tetanus is a very rare bacteria infection that causes painful muscles spasms, potentially leading to death. Tetanus results from the bacteria Clostridium tetani, which reside in soil, saliva, dust, and manure.

# data[].attributes.body
Clonic muscle spasms cause your muscles to involuntarily contract and relax quickly, one after another. Tonic muscle spasms cause your muscle contractions to last very long periods of time before relaxing.

# data[].attributes.body
A spasm is an involuntary muscle contraction that occurs all of a sudden. It can happen when you're dehydrated or haven't stretched enough.

# data[].attributes.body
Muscle fatigue is a decline in one's muscles' abilities to move over time (you find it harder to move). Your muscles feel weak and tired, usually because of overexertion in physical activities.

# data[].attributes.headline
5 Basic Functions of the Muscular System

# data[].attributes.subject
5 Basic Functions of the Muscular System

# data[].attributes.body
The muscular system holds your body straight up, makes movement possible, moves food through your digestive system, aids the flow of blood through veins, and moves fluids for other body systems. In addition, it also generates body heat.

# data[].attributes.attachment_link.title
How your muscular system works - Emma Bryce

# data[].attributes.body
Fascia is a thin sheet of fibrous connective tissue that covers, supports, and separates groups of muscles in every organ. Fascia allows muscles to work independently and smoothly against each other.

# data[].attributes.body
Tendons are narrow and strong bands of non-elastic fibrous connective tissue that attach muscles to bones. There are thousands of them in your body attached to the ends of muscles that help you move.

# data[].attributes.attachment_link.title
The Basic Science of Tendons & Tendinitis