MUSCULAR SYSTEM
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MUSCULAR SYSTEM There are three distinct types of muscles: skeletal muscles, cardiac or heart muscles, and smooth (non-striated) muscles. Musc...

There are three distinct types of muscles: skeletal muscles, cardiac or heart muscles, and smooth (non-striated) muscles. Muscles provide strength, balance, posture, movement and heat for the body to keep warm.

Upon stimulation by an action potential, skeletal muscles perform a coordinated contraction by shortening each sarcomere. The best proposed model for understanding contraction is the sliding filament model of muscle contraction. Actin and myosin fibers overlap in a contractile motion towards each other. Myosin filaments have club-shaped heads that project toward the actin filaments.

Larger structures along the myosin filament called myosin heads are used to provide attachment points on binding sites for the actin filaments. The myosin heads move in a coordinated style, they swivel toward the center of the sarcomere, detach and then reattach to the nearest active site of the actin filament. This is called a rachet type drive system. This process consumes large amounts of adenosine triphosphate (ATP).

Energy for this comes from ATP, the energy source of the cell. ATP binds to the cross bridges between myosin heads and actin filaments. The release of energy powers the swiveling of the myosin head. Muscles store little ATP and so must continuously recycle the discharged adenosine diphosphate molecule (ADP) into ATP rapidly. Muscle tissue also contains a stored supply of a fast acting recharge chemical, creatine phosphate which can assist initially producing the rapid regeneration of ADP into ATP.

Calcium ions are required for each cycle of the sarcomere. Calcium is released from the sarcoplasmic reticulum into the sarcomere when a muscle is stimulated to contract. This calcium uncovers the actin binding sites. When the muscle no longer needs to contract, the calcium ions are pumped from the sarcomere and back into storage in the sarcoplasmic reticulum.
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Finally! Some Posters For My Home Gym

Finally! Some Posters For My Home Gym | MUSCULAR SYSTEM | Scoop.it
muscular-system-poster. The muscular system giant chart measures 42” wide x 62” high…which is almost as tall as I am! It's pretty durable, and I can write on the surface with a dry erase pen if I wanted to.
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Smoking and the Muscular System: The Facts - Life Coach to Quit ...

Smoking and the Muscular System: The Facts - Life Coach to Quit ... | MUSCULAR SYSTEM | Scoop.it
Smoking is harmful for the muscular system, inhibiting growth and weakening the muscles that already exist—just another one of the many reasons it is important to quit smoking.
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The Muscular System 101 - Nutrition Blog – NutriAnswers.com

The Muscular System 101 - Nutrition Blog – NutriAnswers.com | MUSCULAR SYSTEM | Scoop.it
Muscles – we all have them! You may have big muscles best suited to heavy lifting or slender muscles adapted to the demands of running or swimming…either way your body consists of around 850 muscles and in this article ...
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