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Rigor mortis is the reason why the word "stiff" is a slang term for a dead body. Two or three hours after a person or animal dies, the muscle start to stiffen. This phenomenon progresses in a downward, head-to-toe direction. In 12 to 18 hours the body is, as the saying goes, stiff as a board. At this stage, you can move the joints only by force, breaking them in the process.

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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.

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It is ability to generate an action potential in response to a stimulus.Excitability is capable of being readily roused into action or a state of excitement or irritability.Also is capable of being activated by and reacting to stimuli.

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Elasticity is the ability of tissue to regain its original shape and size after being stretched,squeezed,or otherwise deformed.Muscle tissue is generally regarded as elastic because it is able to change size and shape and return to its original condition.Muscle's elasticity returns it to normal resting length following a stretch and provides for the smooth transmission of tension from muscle to bone.

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Contractility of muscle is the capability or quality of shrinking or contracting especially:the power of muscle fibers of shortening into a more compact form.Contractility is basically the ability of the muscle to shorten.

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Extensibility is the ability of  a muscle to be stretched.For instance,lets  reconsider our elbow flexing motion we discussed earlier. In order to be able to flex the elbow, the elbow extensor muscle must extend in order to allow flexion to occur.Lack of extensibility is known as spasticity.

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No doubt,calcium is a key component of strong bones but its presence in your muscle enable movement.Contraction and relaxation of your muscle occur because of rapidly changing concentrations of calcium inside your muscle cells' biochemical process referred to as the calcium cycle.A low blood calcium level,or hypocalcemia, causes muscle irritability.

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Myosin is one of the major protein constituents responsible for contraction of muscle. In muscle cells myosin is arranged in long filament called think filaments that lie parallel to the microfilaments of actin.Myosin and actin also function in the motility of diverse non-muscle cells.

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Theres are different type of actin are actin thin filaments,globular  actin G-actin and filamentous actin F-actin.An actin filaments the smallest cytoskeletal filaments, with a diameter of 7 nanometers.Actin,protein that is an important contributor to the contractile property of muscle and other cells.

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These contain even smaller structures called actin and myosin filaments.These filaments slide in and out between each other to form a muscle contractions, hence called the sliding filament theory!The sliding filament theory is the explanation for how muscle contract to produce force.

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The skeletal muscle attaches to the bones and makes the body motions possible.The skeletal muscle is a voluntary muscle.An examples of the skeletal muscle is the biceps.

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An example of a cardiac muscle is the heart.The cardiac muscle only has one job,but its job is very important.Its job is to pump blood through the miles of the blood vessels in our body.

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The smooth muscle is located in the walls of the internal organs.Some examples of the smooth muscle are the digestive tract,blood vessels,ducts leading to glands.The smooth muscle is a involuntary muscle.

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Tetany is a symptom. Like many symptoms, it can be brought on by variety of conditions.This means thats its sometimes difficult to find what causing this symptoms.While there are effective treatments for the condition, preventing it often depends on pinpointing what caused it in the first place.

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Tetanus,or also called lockjaw's a serious infection caused by Clostridium Tetani. This bacterium produces a toxin that affects the brain and nervous system, leading to stiffness in the muscle.Although tetanus treatments exists, it is not uniformly effective.

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Clonic spasms refer to alternating involuntary muscular contraction and relaxation in quick succession.While tonic spasms are rigid muscle contractions that last a period of time.Overall muscle spasms can be harmless, caused by a minor muscle contraction, or the sign of something more serious

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Spasms can affect many different type of muscle in the body, leading to many different symptoms.Spams of skeletal muscle are most common and are often due to overuse and muscle fatigue, dehydration, and electrolyte abnormalities.The spams occurs abruptly,is painful, and is usually short-lived.

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Fatigue is multifactorial-it has diverse cause and many components, and expresses itself in varied way.Even if we postpone discussion of mental fatigue, the purely physical dimension of the word will prove more flexible than the first-time enquirer probably suspects.

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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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The muscular system of the human body consists of skeletal muscles, cardiac muscle and smooth muscle.Skeletal muscles its name suggest attaches primarily to the skeleton and moves voluntarily or by reflex.Some of the parts of the muscular system are involuntarily and some are voluntarily.

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Fascia is a sheet of fibrous connective tissue that covers,supports,and separates muscle or group of muscle.However the fascia tissue is more elastic than muscle. One important thing to know is that all fascia is connective tissue,but not all connective tissue is fascia.

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Narrow bands of nonelastic,dense,fibrous connective tissue that attaches a muscle to a bone.The tendon is firmly connected to muscle fibers at one end and to components of the bone at its other end.Tendons are remarkably storng,having one of the highest tensile strengths found among soft tissues.