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

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.

Posted Date: 10/1/2012 3:59:05 AM | Location : United States







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