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How Do Muscles Work?
Some muscles, like the muscles in your heart and digestive system, are involuntary. They work by themselves without you consciously telling them to do anything. Other muscles are voluntary, meaning you order them to move. Both types of muscles are... More »
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Source: www.ehow.com

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 ...

www.medicinenet.com/how_muscles_work_and_respond_to_resistance_exercise/views.htm

Dec 12, 2016 ... 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 ...

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.

.ask.com/youtube?q=How+Do+Muscles+Work%3F&v=f_F5UwtdPOc
Sep 24, 2014 ... Your muscles give you power to move and do important jobs in your body. Watch this movie for kids and find out more.
.ask.com/youtube?q=How+Do+Muscles+Work%3F&v=jxk5tFiGVSE
Jan 8, 2009 ... How Muscles Work. ... Big Guns: The Muscular System - CrashCourse Biology # 31 - Duration: 12:52. CrashCourse 882,778 views · 12:52.
.ask.com/youtube?q=How+Do+Muscles+Work%3F&v=76h0eixRGas
Jan 21, 2016 ... Dr. Angelina Whalley, curator of BODY WORLDS, talks with WSOC's Laura Palka about what keeps our bodies moving and how to keep ...

www.reference.com/science/muscles-work-7b6173dd51a25b5c

In general, muscles work when calcium ions are released, which triggers muscle cells to contract. The contracting muscles pull on tendons, which in turn pull on ...

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 ...

www.ducksters.com/science/muscles.php

Some muscles work without us thinking, like our heart beating, while other muscles are controlled by our thoughts and allow us to do stuff and move around.