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Rigor mortis is the stiffening of muscle after death. This occurs because of chemical changes in the myofibrils. Rigor mortis helps estimate the time since death.

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Muscle automaticity is the ability to do things without thinking (automatically) with the low level details-it is a habit. An example of this is the heart automatically pumping blood.

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Excitability is the ability to receive and respond to stimuli via generation of an electrical pulse which causes contraction of muscle cells. Excitability allows a muscle to respond to a stimulus.

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Elasticity refers to the ability of muscle fiber to recoil and resume its resting length. It focuses on the muscles ability to return to their original shape after an extension or contraction. An example of muscle elasticity is jumping activities.

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Extensibility refers to the ability of a muscle to be stretched or extended past its normal resting point. A common example of this is streching.

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Contractility is the ability of muscle cells to shorten. Muscle contraction enables movement. Muscle contraction occurs when the thin actin and thick myosin filaments slide past each other.

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Calcium facilitates the interaction between actin and myosin during muscle contraction. Calcium is critical for muscle contraction, and maintaining strong bones.

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Myosin is a motor protein. A motor protein generates force and movement by converting chemical energy (ATP) to mechanical energy.

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Actin is an abundant protein in eukaryotic cells and aids in muscle contraction and cell movements. Filaments are made up of actin molecule.

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Cardiac muscle has striated, tubular, branched, uni-nucleated fibers. Cardiac muscle is involuntary. Cardiac muscle is responsible for the ability of the heart to pump blood.

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Skeletal muscle attaches to the bones and makes body motions possible. Skeletal muscle is voluntary. Skeletal muscle is attached by tendons to the bones of the skeleton.

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Smooth muscle is a type of muscle located in the walls of internal organs. It is an involuntary muscle. Some examples of smooth is the digestive tract, blood vessels, and ducts leading to the glands.

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skeletal tissue longitudinal section actin cardiac histology actin myosin cells multi unit dense bodies

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The sliding filament theory describes the mechanism that allows the muscles to contract. According to this theory, myosin (a motor protein) binds to actin(another motor protein) and this enables muscle contraction.

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Tetany is identified by intermittent muscle spasms that are caused by a deficiency of calcium. The most common treatment for tetany is directly injecting calcium into the blood.

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Tetanus is a disease caused by a bacteria called Clostridium tetani. The bacteria causes painful muscle contractions. Tetanus is also called lockjaw.

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The tendon connects muscle to bone. There are about 4000 tendons in the human body.

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The fascia is a thin layer of connective tissue that surrounds every organ to keep it in place. Fascia is mostly made up of collagen, which is a common protein in the body.

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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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1. Muscles hold the body erect
2. Makes movement possible
3. Moves food through the digestive system
4. Muscle movement aids the flow of blood through veins
5. Muscle actions move fluid through the ducts and tubes associated with other body systems
***The muscular system also generates body heat

Muscles make up around 40% of our total body weight

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Muscle fatigue decreases your muscles ability to perform over time. A common cause of this is old age.

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A spasm is a sudden, violent, involuntary contraction of 1 or more muscles. A spasm frequently occurs in the eye, also known as a eye twitch.

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Clonic muscle spasms are short bursts of contractions of the muscle. Tonic muscle spasms occur over a long time, and like clonic muscle spasms there's a break/rest before the next spasm. They are both contraction of muscles, but the time period varies. Spasms can be decreased by applying ice on the affected area.