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Answer: The involuntary muscles can also be called by the terms such as Unstriped muscles or by non-striated muscles. These are the types of muscles that function without any conscious control and are done by the autonomic nervous system (ANS).
These muscles are associated with other internal organs which exhibit slow, involuntary, and regular actions, such as the respiratory system or the digestive system. These are located in the lines of the organs like the blood vessels, urinary bladders, stomach, etc., and in the cardiac muscles, these muscles are present in the heart.
The energy requirement for the movement of smooth involuntary muscles is quite low but when it comes to involuntary movement in cardiac muscles the energy requirement is high. These are essential for the proper functioning of all the internal organs in the body for example removal of the waste products from the body and beating of the heart.
The structure of the smooth involuntary muscle is thin, long, and spindle-shaped in which the nucleus is present in the centre and it has very few numbers of mitochondria in them.
Key points to Remember
Involuntary muscles|
Cell type |
Uninucleated |
|
Shape |
Unstriped and plain |
|
Nucleus location |
Centrally |
|
Controlled by |
Autonomic nervous system |
|
Rate of contractions |
Slow |
|
Energy requirement |
Low energy required |
|
Examples |
Blood vessels, respiratory tracts, ducts of the glands, and the alimentary tracts too |
