Differences between single-unit and multi-unit muscles, Biology

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DIFFERENCES BETWEEN SINGLE-UNIT AND MULTI-UNIT SMOOTH MUSCLES

	Single-unit Smooth Muscles		Multi-unit Smooth Muscles
1.	They are composed of muscle fibres closely	1.	They are composed of muscle fibres not so
	joined together.		closely joined together.
2.	All the fibres of single smooth muscle	2.	All the fibres of a multiunit muscle contract
	contract together as a single unit.		as separate units.
3.	Muscles of the wall of hollow visceral organs	3.	Muscles of the wall of large blood vessels,
	(e.g., Gastrointestinal tract and urinary		arrector pili muscles of skin dermis, ciliar and
	bladder) are examples of this type of muscles.		iris muscles in the eyes are examples of this
			type of muscles.

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