Muscle is a soft tissue found in most animals. Muscle cells contain protein filaments of actin and myosin that slide past one another, producing a contraction that changes both the length and the shape of the cell. Muscles function to produce force and motion. They are primarily responsible for maintaining and changing posture, locomotion, as well as movement of internal organs, such as the contraction of the heart and the movement of food through the digestive system via peristalsis.

Muscle tissues are derived from the mesodermal layer of embryonic germ cells in a process known as myogenesis. There are three types of muscle, skeletal or striated, cardiac, and smooth. Muscle action can be classified as being either voluntary or involuntary. Cardiac and smooth muscles contract without conscious thought and are termed involuntary, whereas the skeletal muscles contract upon command. Skeletal muscles in turn can be divided into fast and slow twitch fibers. (source : wikipedia)

Animals Gone Wild: Prostitution in Animal Species
Cher impersonators, scantily c..

A Dummy's Guide to Poker: Texas Hold 'Em

5 Easy Tips for Getting Tack-Sharp Photos with Your Mobile Phone
Have you ever wondered why the..

8 pictures of gigantic dogs that will leave you shocked
The domestic dog is a domesti..

Undisputed YouTube Chili king takes it too far with 9 million scoville chili extract. WARNING, VERY GRAPHIC!
Drinks a full bottle of Mad Do..

6 of the biggest burgers in history
Whats your favorite kind of burger?