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==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from [[Latin]] ''musculus'', from diminutive of ''mus mouse''
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1a : a [[body]] tissue consisting of long [[cells]] that contract when [[stimulated]] and produce [[motion]]
:b : an organ that is essentially a mass of muscle tissue attached at either end to a fixed [[point]] and that by contracting moves or checks the movement of a body part
*2a : muscular [[strength]] : brawn
:b : [[effective]] strength : power <[[political]] muscle>
==Description==
'''Muscle''' is a [http://en.wikipedia.org/wiki/Muscle_contraction contractile] tissue of [[animals]] and is derived from the [http://en.wikipedia.org/wiki/Germ_layer 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 [http://en.wikipedia.org/wiki/Skeletal_muscle skeletal], [http://en.wikipedia.org/wiki/Cardiac_muscle cardiac], or [http://en.wikipedia.org/wiki/Smooth_muscle smooth] muscles. Their [[function]] is to produce [[force]] and cause [[motion]]. Muscles can cause either locomotion of the [[organism]] itself or movement of [http://en.wikipedia.org/wiki/Organ_(anatomy) internal organs]. Cardiac and smooth muscle contraction occurs without [[conscious]] [[thought]] and is necessary for [[survival]]. Examples are the contraction of the [[heart]] and [http://en.wikipedia.org/wiki/Peristalsis peristalsis] which pushes food through the [http://en.wikipedia.org/wiki/Digestion 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 [http://en.wikipedia.org/wiki/Quadriceps_femoris_muscle 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.
Muscles are predominantly powered by the oxidation of [http://en.wikipedia.org/wiki/Fat fats] and [http://en.wikipedia.org/wiki/Carbohydrate carbohydrates], but [http://en.wikipedia.org/wiki/Anaerobic_respiration anaerobic] chemical reactions are also used, particularly by fast twitch fibers. These chemical reactions produce [http://en.wikipedia.org/wiki/Adenosine_triphosphate adenosine triphosphate] (ATP) molecules which are used to power the movement of the [http://en.wikipedia.org/wiki/Myosin myosin] heads. [http://en.wikipedia.org/wiki/Muscle]
[[Category: Biology]]
==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from [[Latin]] ''musculus'', from diminutive of ''mus mouse''
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1a : a [[body]] tissue consisting of long [[cells]] that contract when [[stimulated]] and produce [[motion]]
:b : an organ that is essentially a mass of muscle tissue attached at either end to a fixed [[point]] and that by contracting moves or checks the movement of a body part
*2a : muscular [[strength]] : brawn
:b : [[effective]] strength : power <[[political]] muscle>
==Description==
'''Muscle''' is a [http://en.wikipedia.org/wiki/Muscle_contraction contractile] tissue of [[animals]] and is derived from the [http://en.wikipedia.org/wiki/Germ_layer 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 [http://en.wikipedia.org/wiki/Skeletal_muscle skeletal], [http://en.wikipedia.org/wiki/Cardiac_muscle cardiac], or [http://en.wikipedia.org/wiki/Smooth_muscle smooth] muscles. Their [[function]] is to produce [[force]] and cause [[motion]]. Muscles can cause either locomotion of the [[organism]] itself or movement of [http://en.wikipedia.org/wiki/Organ_(anatomy) internal organs]. Cardiac and smooth muscle contraction occurs without [[conscious]] [[thought]] and is necessary for [[survival]]. Examples are the contraction of the [[heart]] and [http://en.wikipedia.org/wiki/Peristalsis peristalsis] which pushes food through the [http://en.wikipedia.org/wiki/Digestion 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 [http://en.wikipedia.org/wiki/Quadriceps_femoris_muscle 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.
Muscles are predominantly powered by the oxidation of [http://en.wikipedia.org/wiki/Fat fats] and [http://en.wikipedia.org/wiki/Carbohydrate carbohydrates], but [http://en.wikipedia.org/wiki/Anaerobic_respiration anaerobic] chemical reactions are also used, particularly by fast twitch fibers. These chemical reactions produce [http://en.wikipedia.org/wiki/Adenosine_triphosphate adenosine triphosphate] (ATP) molecules which are used to power the movement of the [http://en.wikipedia.org/wiki/Myosin myosin] heads. [http://en.wikipedia.org/wiki/Muscle]
[[Category: Biology]]