Muscular System

Body System

Function

The function for the muscular system is to move the body and give it strength.

Muscular Tissues

Cardiac Muscle Cell- Muscle tissue that has evolved to pump blood throughout the body, only found in the heart.

Skeletal Muscle Cell- Long and narrow. The muscle that help the body contract and have movement.

Smooth Muscle Cell- Responsible for the hollow organs.

How skeletal muscle contracts

An action from a motor neuron triggers the release of Calcium ions from the scar plasmic reticulum. The myosin heads form a cross-bridge with actin binding sites. ATP binds to the myosin heads and breaks the crossing bridge.

Myasthenia Gravis

When the persons own immune system attacks the body. Attacks between the nerve and muscle, which blocks signals that would tell the muscle to move. Symptoms and signs are muscle weakness, drooping eyelids, trouble swallowing , and shortness of breaths. About 20 per 100,000 are affected. Cholinesterase inhibitors are capable of elevating the signals between the nerve and muscle. Surgical removal of the thymus gland may provide benefits.

Muscle Dystrophy

A group of diseases that causes progressive weakness and loss of muscle mass. In this disorder abnormal genes (mutations) interfere with production of protein needed to form healthy muscles. Weakness of muscles, difficulty walking or maintaining balance, drooping eyelids, curved spine, and problems breathing are some signs and symptoms. Males are more likely to be affected. About 16 out of every 1000,000 males affected every year. There is no cure for muscular dystrophy. Usually the symptoms are treated individually.