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			== Muscle_cell ==
			<gallery>
			File:Synapse_diag3.png\|Synapse diagram
			File:Blausen_0801_SkeletalMuscle.png\|Skeletal muscle diagram
			File:Sliding_Filament_Mechanism_Diagram.pdf\|Sliding filament mechanism diagram
			</gallery>

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'''Muscle cell'''

A '''muscle cell''', also known as a '''myocyte''', is a type of cell that makes up muscle tissue. There are three types of muscle cells in the human body: skeletal, cardiac, and smooth muscle cells. Each type has a unique structure and function.

== Structure ==

Muscle cells are elongated and are packed with [[myofibrils]], which are bundles of [[protein]] filaments that play a key role in muscle contraction. The cell's cytoplasm, known as the [[sarcoplasm]], contains numerous [[mitochondria]] to meet the energy demands of the cell.

=== Skeletal muscle cells ===

[[Skeletal muscle]] cells, also known as muscle fibers, are long, cylindrical cells that contain multiple nuclei. They are surrounded by a plasma membrane called the [[sarcolemma]], which helps transmit signals from the nervous system.

=== Cardiac muscle cells ===

[[Cardiac muscle]] cells, or cardiomyocytes, are shorter and branched, with one or two centrally located nuclei. They are connected by [[intercalated discs]], which allow electrical signals to pass between cells, coordinating their contraction.

=== Smooth muscle cells ===

[[Smooth muscle]] cells are spindle-shaped and contain a single nucleus. Unlike skeletal and cardiac muscle cells, they do not have striations.

== Function ==

Muscle cells are responsible for producing force and motion. They do this by contracting in response to electrical signals from the nervous system.

=== Skeletal muscle cells ===

Skeletal muscle cells contract to move the bones of the skeleton. They are under voluntary control, meaning we can consciously control their contraction.

=== Cardiac muscle cells ===

Cardiac muscle cells contract to pump blood throughout the body. They are under involuntary control, meaning their contraction is not consciously controlled.

=== Smooth muscle cells ===

Smooth muscle cells contract to move substances through the body's organs, such as food through the digestive tract or blood through the blood vessels. They are also under involuntary control.

== See also ==

* [[Muscle tissue]]
* [[Muscle contraction]]
* [[Myofibril]]
* [[Sarcoplasm]]
* [[Mitochondria]]
* [[Sarcolemma]]
* [[Intercalated disc]]

[[Category:Cell biology]]
[[Category:Muscular system]]
[[Category:Human cells]]

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Muscle cell - Revision history

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