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Muscle (from Latin musculus, diminutive of mus "mouse") is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to produce force and cause motion. Muscles can cause either locomotion of the organism itself or movement of internal organs. Cardiac and smooth muscle contraction occurs without conscious thought and is necessary for survival. Examples are the contraction of the heart and peristalsis which pushes food through the digestive system. Voluntary contraction of the skeletal muscles is used to move the body and can be finely controlled. Examples are movements of the eye, or gross movements like the quadriceps muscle of the thigh. There are two broad types of voluntary muscle fibers: slow twitch and fast twitch. Slow twitch fibers contract for long periods of time but with little force while fast twitch fibers contract quickly and powerfully but fatigue very rapidly.

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Wikipedia about muscles

Skeletal%20muscle.jpg

Muscle (from Latin musculus, diminutive of mus "mouse") is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to produce force and cause motion. Muscles can cause either locomotion of the organism itself or movement of internal organs. Cardiac and smooth muscle contraction occurs without conscious thought and is necessary for survival. Examples are the contraction of the heart and peristalsis which pushes food through the digestive system. Voluntary contraction of the skeletal muscles is used to move the body and can be finely controlled. Examples are movements of the eye, or gross movements like the quadriceps muscle of the thigh. There are two broad types of voluntary muscle fibers: slow twitch and fast twitch. Slow twitch fibers contract for long periods of time but with little force while fast twitch fibers contract quickly and powerfully but fatigue very rapidly.

Types

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  • Skeletal muscle or "voluntary muscle" is anchored by tendons to bone and is used to affect skeletal movement such as locomotion and in maintaining posture. Though this postural control is generally maintained as a subconscious reflex, the muscles responsible react to conscious control like non-postural muscles. An average adult male is made up of 40–50% of skeletal muscle and an average adult female is made up of 30–40% (as a percentage of body mass).Fact: date=April 2008
  • Smooth muscle or "involuntary muscle" is found within the walls of organs and structures such as the esophagus, stomach, intestines, bronchi, uterus, urethra, bladder, blood vessels, and even the skin (in which it controls erection of body hair). Unlike skeletal muscle, smooth muscle is not under conscious control.
  • Cardiac muscle is also an "involuntary muscle" but is more akin in structure to skeletal muscle, and is found only in the heart.

Cardiac and skeletal muscles are "striated" in that they contain sarcomeres and are packed into highly-regular arrangements of bundles; smooth muscle has neither. While skeletal muscles are arranged in regular, parallel bundles, cardiac muscle connects at branching, irregular angles (called intercalated discs). Striated muscle contracts and relaxes in short, intense bursts, whereas smooth muscle sustains longer or even near-permanent contractions.

Skeletal muscle is further divided into several subtypes:

Search results for Muscles

HowStuffWorks "How Muscles Work"

Muscles are your body's engine, and you couldn't do anything without them. ... Introduction to How Muscles Work. Skeletal-muscle Basics. Contracting a Muscle ...health.howstuffworks.com/muscle.htm

Muscular system - Wikipedia, the free encyclopedia

Main article: Table of muscles of the human body ... combined rectus femoris and vastus muscles. femoral artery. Femoral nerve ...en.wikipedia.org/wiki/Muscular_system

Superficial Muscles Tutorial

Interactive maps of major superficial muscles using JavaScript ... Muscles Tutorial. The following tutorials will allow you to review the names and ...www.gwc.maricopa.edu/class/bio201/muscle/mustut.htm

Patient Education Tutorials: Muscles

Skip to Content. Muscles. Starts multimedia presentation with questions. Requires Flash Player. ... The interactive multimedia tutorial is accessible without a ...www.nlm.nih.gov/medlineplus/tutorials/muscles/htm/index.htm

Muscle Tissue and Muscles

Muscles. There are three different types of muscle tissue. These include the skeletal muscles which are under voluntary control and are ...biology.clc.uc.edu/courses/bio105/muscles.htm

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News about Muscles

Candid Barack Obama urges Hispanic voters to flex their muscles

Guardian UnlimitedDemocrat campaign targets the swing state of New Mexico in attempt to boost turnout among Hispanicshttp://www.guardian.co.uk/world/2008/oct/02/democrats.newmex...

Frown upside down!

Deccan HeraldIt takes fewer muscles to smile than frown. A clichéd statement? Yes. But very apt. Humans have been naturally endowed with the ability to smile and immediately connect even with strangers.http://www.deccanherald.com/Content/Oct32008/metro2008100293...

Standardbred sale off to a hot start

Lexington Herald-Leader The Lexington Selected Yearling Sale of Standardbreds opened Wednesday night with a bang. On the first night of the five-session sale, 98 yearlings sold for a cumulative $8,805,000, an average price of $89,847. The top seller was a colt named Capo Dolce, by Muscles Yankee out of the Conway Hall mare Pizza Dolce; the trotter sold for $415,000 to David McDuffee of Nashua, N.H., from ...http://www.kentucky.com/103/story/543287.html

For Tighter Abs, Look to Core Strengthening

NewswiseMany of us would like to firm up our tummies, a goal that seems more frustrating and elusive the older we get. Working on strengthening a variety of trunk muscles, collectively known as "the core," can help with that--and much more, reports the October 2008 issue of Harvard Women's Health Watch.http://www.newswise.com/articles/view/544896/?sc=rsmn

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Tiscaliuse similar facial muscles. Fear and surprise are two examples of this. Parr found the same to be true of chimps.http://www.tiscali.co.uk/news/newswire.php/news/reuters/2007...

News about Muscles

At Last, European Union

Wall Street JournalFollowing Saturday's vague G-7 "action plan," euro zone leaders met yesterday to put, in the words of French Finance Minister Christine Lagarde, "more meat and muscles on that skeleton." Much of that meat was British. Following London's lead, euro ... http://online.wsj.com/article/SB122385622622827189.html?mod=

Body by Google

Globe and MailVote for a STRONG leader,” is the script on the button. Underneath the writing is a picture of Stephane Dion with rippled shoulders, impressive pectoral muscles and a six-pack torso. She found the body to put on Mr. Dion's head by Googling ... http://www.theglobeandmail.com/servlet/story/RTGAM.20081012....

Scramble to save banks as IMF warns of meltdown

Times of IndiaFrance's Economy Minister, Christine Lagarde, said just before leaving Washington that the Sunday gathering would go beyond talking about remedies to "put meat, muscles on the bones of that skeleton and to develop, follow up and execute upon it ... http://timesofindia.indiatimes.com/Business/Intl_Business/Sc...

Scar tissue and back pain

NWITimes.comIt is for this reason that it is recommended that occasional breaks from sitting is good to not only relax the muscles but also to stretch them. By getting up and walking around the muscles get a chance to relax from the static position that sitting ... http://nwitimes.com/articles/2008/10/12/get_healthy/get_heal...

Killer disease identified as arenavirus carried by mice

Cape TimesBiopsies conducted on the last two victims where infected tissues, skin, liver and muscles were tested were critically important in being able to make a diagnosis. Blumberg said yesterday a female nurse and a male paramedic were currently in ... http://www.capetimes.co.za/?fArticleId=4657660

Search results for Muscles

Your Muscles

You have more than 600 muscles in your body! Find out more in this article for kids. ... Did you know you have more than 600 muscles in your body? They help you do almost ... http://www.kidshealth.org/kid/htbw/muscles.html

Muscles

Muscles Animals use muscles to convert the chemical energy of ATP into mechanical work. Three different kinds of muscles are found in vertebrate animalshttp://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Mus...

HowStuffWorks "How Muscles Work"

Muscles are your body’s engine, and you couldn’t do anything without them. Learn about skeletal muscle, smooth muscle, and cardiac muscle and how muscle contraction works.http://www.howstuffworks.com/muscle.htm

Muscles

Here is some simple information for GCSE biology students about the different types of muscle tissues and why muscles work in antagonistic pairs.http://www.purchon.com/biology/muscles.htm

Muscles

Fireworks Splice HTML ... Muscles join onto bones. They pull the bones to make my body move. Muscles move my body.http://www.kidcyber.com.au/topics/bodymuscles.htm
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Shiny Ahuja Working His Muscles

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Fresh Idea: Flexing Kids' Musical M...

Fresh Idea: Flexing Kids' Musical MusclesThe Children's Museum of Utah offers programs to help kids explore music.Windows Media - Video

US and Russia flex their military m...

US and Russia flex their military muscles.Russia has sent a missile cruiser and two other ships to Sukhumi, the capital of Abkhazia, after a US military ship docked at a southern port in Georgia. The show of force...RealMedia - Video

North Korea flexes nuclear muscles

North Korea flexes nuclear musclesNorth Korea threatens to halt disabling of its nuclear facilities accusing the U.S. of violating a disarmament deal.Flash - Video

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ATHLETES listen up! What makes your...

ATHLETES listen up! What makes your muscles burn during a workout...ATHLETES listen up! What makes your muscles burn during a workout 3 min 5 sec - Dec 21, 2006 Tim Van Orden explains what makes your muscles burn during a workout and it is not the lactic acid you ar...flash: 0 MB w:320px - h:213px

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Answers for Muscles

Tulip

What are the hardest muscles to develop: upper or lower body muscles?

TulipThe answer is it depends on you. Due to genetic factors some people have a harder time developing some muscles then other muscles. The "Govenator" for example always struggled with his calf's, which m...
wonder

How does muscles and weight theory work? If I have flabs does it turn into muscles?

wonderMuscles will build up under the fat and push it out, which can actually make you look fatter. With the cardio you are doing, you are probably burning some of that fat, but you are probably also putti...
♪God'sMusician♪

How do skeletal muscles work with tendons to cause movement?

♪God'sMusician♪
yo

What is the best way to get big muscles with out drugs?

yoI know of a way that does not involve steroids, but it does involve vitamin supplements that are legal. DHEA, l-arginine - an amino acid, and creatine are all vitamins that can be purchased at gnc, v...
Eric

What type of muscles are better? A bulge of muscles or muscles that are spread out?

EricI am going to reccommend something cheap and way more effective than any other weight system you will buy. All you need to get ripped is the perfect pushup system. I know that sounds like an infomerci...

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