The Muscular System

By: Anthony Martinez

The Function of The Muscular System

The function of the Muscular System is to provide support for human movement, to create proper posture and to circulate blood.

A Diagram of A Sarcomere

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How Skeletal Muscles Contracts

When muscles contract, actin moves the myosin over and causes the sarcomere to shorten actin fibers are thin and myosin fibers are thick

arriving action potential causes Ca2+ to be released from endoplasmic reticulum Ca2+ binds to troponin which causing troponin and tropomyosin to move this exposes binding sites on actin for myosin. ATP binds to myosin heads which releases them and breaks cross bridges, ATP hydrolyzed and the energy causes myosin heads to change shape.

Two Disorders In The Muscle System

Muscular Dystrophy

Description: Muscular Dystrophy is a disease that causes weakness and progressive loss of muscle mass.

Symptoms: Symptoms of Muscular Dystrophy are Frequent falls, difficulty getting up from a lying or sitting position, trouble running and jumping, waddling gait, walking on the toes, large calf muscles, muscle pain and stiffness, and learning disabilities.

Prevalence: About 1 out of every 7,000 males suffer from Muscular Dystrophy.

Treatment: There is no cure for Muscular Dystrophy, but physical therapy can control the symptoms.


Description: Myopathy is a disease that causes skeletal and voluntary muscles to become weak and wasted.

Symptoms: The symptoms of Myopathy are aching, cramping, pain, stiffness, tenderness, and tightness.

Prevalence: 1 in 3330 of boys suffer from Myopathy.

Treatment: The treatment for Myopathy is therapy and bracing to support the muscles.