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en.wikipedia.org/wiki/Muscle

Muscle is a soft tissue found in most animals. Muscle cells contain protein filaments of actin and ..... The heart does its work continuously over an entire lifetime without pause, and thus does "outwork" other muscles. An output of one watt ...

health.howstuffworks.com/human-body/systems/musculoskeletal/muscle.htm

Muscles are the "engine" that your body uses to propel itself. Although they work differently than a car engine or an electric motor, muscles do the same thing ...

kidshealth.org/en/kids/muscles.html

You control some of your muscles, while others — like your heart — do their jobs without you thinking ... But smooth muscles are at work all over your body.

www.medicinenet.com/how_muscles_work_and_respond_to_resistance_exercise/views.htm

There are 3 types of muscle in the human body. Skeletal, smooth, and cardiac. In order for muscles to move your entire body has to work to make the movement ...

www.sciencedaily.com/releases/2014/11/141126151435.htm

Nov 26, 2014 ... Scientists have elucidated the molecular structure and regulation of the essential muscle protein alpha-actinin. The new findings allow ...

www.runsweet.com/starting-sports/how-do-muscles-work

Muscles are the contractile tissue of the body, and produce all movement, and circulation in the body. One muscle fibre is a cell and is composed of a number of  ...

study.com/academy/lesson/what-is-the-muscular-system-function-how-muscles-work-in-groups.html

Ever feel overwhelmed when you look at all those muscles in your textbooks? Well, if you do, then maybe learning a little about their anatomy and...

web.kidsactivitiesblog.com/17436/how-do-muscles-work

Aug 13, 2012 ... Nicholas has been learning about the muscles in his body. He's learned about the tree types of muscles - smooth, skeletal, and cardiac.

www.livescience.com/39024-human-body-system-musculature-infographic.html

Aug 20, 2013 ... The heart is the hardest-working muscle. It pumps out 2 ounces (57 grams) of blood with every heartbeat. Daily, the heart pumps at least 2,500 ...