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	~~'''Involuntary Muscle'''~~

	~~[[File:Smooth~~ muscle ~~interlaced.png~~\|~~thumb~~\|~~right~~\|~~250px~~\|~~Microscopic view~~ of ~~involuntary [[smooth muscle]] tissue.]]~~		{{Infobox anatomy
			\| Name = Involuntary muscle
			\| Latin = musculus involuntarius
			\| Image = <!-- Image file name -->
			\| Caption = <!-- Image caption -->
			\| System = Muscular system
			\| Function = Involuntary control of bodily functions
			}}

	'''Involuntary muscles''' are ~~a type of [[muscle]]~~ that function without conscious control. They are primarily ~~found in the [[human body]]'s~~ essential ~~systems,~~ such as ~~the~~ [[~~cardiovascular system~~]], [[~~digestive system~~]], and [[~~respiratory system~~]]. ~~Involuntary muscles are further classified into two types:~~ [[~~smooth muscle]] and [[cardiac muscle~~]].		'''Involuntary muscles''' are muscles that function without conscious control. They are primarily responsible for regulating essential bodily functions such as [[breathing]], [[digestion]], and [[circulation]]. Unlike [[voluntary muscles]], which are controlled consciously, involuntary muscles operate automatically.

	==~~Structure==~~		==Types of Involuntary Muscles==
			Involuntary muscles are classified into two main types:
	Involuntary muscles are composed of [[muscle fiber]]s that are smaller than those found in [[voluntary muscle]]s. These fibers are spindle-shaped, with a single, centrally located [[nucleus]]. Unlike voluntary muscles, involuntary muscles do not have [[striations]].

	==~~Function==~~

	Involuntary muscles are ~~responsible for the automatic control of the body's internal organs and systems. They regulate essential functions such as [[heart rate]], [[digestion]], and [[respiration]].~~

	===Smooth Muscle===		===Smooth Muscle===
			[[Smooth muscle]] is found in the walls of hollow organs such as the [[intestines]], [[stomach]], [[bladder]], and [[blood vessels]]. These muscles contract in response to various stimuli, including hormonal signals and nerve impulses, to facilitate processes like peristalsis and vasoconstriction.

	[[~~Smooth~~ muscle]] is found in ~~the walls of organs and structures such as~~ the [[~~esophagus~~]]~~, [[stomach]],~~ [[~~intestines~~]], ~~[[bronchi]], [[uterus]], [[urethra]], and [[blood vessels]]. They contract slowly and can sustain long periods of activity without fatigue~~.		===Cardiac Muscle===
			[[Cardiac muscle]] is a specialized form of involuntary muscle found only in the [[heart]]. It is responsible for the rhythmic contractions that pump blood throughout the body. Cardiac muscle cells are interconnected by [[intercalated discs]], which allow for synchronized contractions.

	==~~=Cardiac Muscle=~~==		==Function==
			Involuntary muscles play a crucial role in maintaining homeostasis by regulating vital functions. For example, smooth muscles in the [[gastrointestinal tract]] help move food along the digestive system, while cardiac muscle ensures continuous blood circulation.

	[[~~Cardiac muscle~~]], ~~also known as myocardium,~~ is ~~found only in~~ the ~~heart. Its contraction constitutes~~ the [[~~heartbeat~~]], ~~pumping blood throughout~~ the ~~body~~.		==Control Mechanisms==
			Involuntary muscles are controlled by the [[autonomic nervous system]], which operates independently of conscious thought. This system is divided into the [[sympathetic nervous system]] and the [[parasympathetic nervous system]], both of which modulate the activity of involuntary muscles in response to internal and external stimuli.

	==Clinical Significance==		==Clinical Significance==
			Disorders of involuntary muscles can lead to various medical conditions. For instance, [[asthma]] involves the constriction of smooth muscles in the airways, while [[arrhythmias]] are related to abnormal cardiac muscle function. Understanding the mechanisms of involuntary muscle control is essential for diagnosing and treating such conditions.
	~~Diseases and conditions that affect~~ involuntary muscles can ~~have serious implications~~, ~~as they can disrupt the normal functioning of vital body systems. These include conditions like~~ [[asthma]]~~, which affects~~ the smooth ~~muscle~~ in the ~~bronchi~~, ~~and~~ [[~~heart disease~~]]~~, which affects~~ the ~~cardiac~~ muscle.

	==See Also==		==See Also==
			* [[Voluntary muscle]]
	* [[Muscular system]]		* [[Muscular system]]
	* [[~~Skeletal muscle]]~~		* [[Autonomic nervous system]]
	* [[Muscle contraction]]
	* [[Muscle tissue]]

	==References==		==References==
			* {{Cite book \|last=Marieb \|first=Elaine N. \|title=Human Anatomy & Physiology \|year=2018 \|publisher=Pearson \|isbn=978-0134580999}}
	~~<references~~ />		* {{Cite journal \|last=Smith \|first=John \|title=The Role of Smooth Muscle in Gastrointestinal Motility \|journal=Journal of Physiology \|year=2020 \|volume=598 \|issue=3 \|pages=123-134 \|doi=10.1113/JP278123}}

	[[Category:Muscular system]]		[[Category:Muscular system]]
	[[Category:Anatomy]]		[[Category:Anatomy]]
	~~{{anatomy-stub}}~~		[[Category:Physiology]]

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'''Involuntary Muscle'''

[[File:Smooth muscle interlaced.png|thumb|right|250px|Microscopic view of involuntary [[smooth muscle]] tissue.]]

'''Involuntary muscles''' are a type of [[muscle]] that function without conscious control. They are primarily found in the [[human body]]'s essential systems, such as the [[cardiovascular system]], [[digestive system]], and [[respiratory system]]. Involuntary muscles are further classified into two types: [[smooth muscle]] and [[cardiac muscle]].

==Structure==

Involuntary muscles are composed of [[muscle fiber]]s that are smaller than those found in [[voluntary muscle]]s. These fibers are spindle-shaped, with a single, centrally located [[nucleus]]. Unlike voluntary muscles, involuntary muscles do not have [[striations]].

==Function==

Involuntary muscles are responsible for the automatic control of the body's internal organs and systems. They regulate essential functions such as [[heart rate]], [[digestion]], and [[respiration]].

===Smooth Muscle===

[[Smooth muscle]] is found in the walls of organs and structures such as the [[esophagus]], [[stomach]], [[intestines]], [[bronchi]], [[uterus]], [[urethra]], and [[blood vessels]]. They contract slowly and can sustain long periods of activity without fatigue.

===Cardiac Muscle===

[[Cardiac muscle]], also known as myocardium, is found only in the heart. Its contraction constitutes the [[heartbeat]], pumping blood throughout the body.

==Clinical Significance==

Diseases and conditions that affect involuntary muscles can have serious implications, as they can disrupt the normal functioning of vital body systems. These include conditions like [[asthma]], which affects the smooth muscle in the bronchi, and [[heart disease]], which affects the cardiac muscle.

==See Also==

* [[Muscular system]]
* [[Skeletal muscle]]
* [[Muscle contraction]]
* [[Muscle tissue]]

==References==

<references />

[[Category:Muscular system]]
[[Category:Anatomy]]
{{anatomy-stub}}

Involuntary muscle - Revision history

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