Question

What are various types of muscles explain

Answer 1

There are three types of muscle found in the human body:

Skeletal Muscle

Smooth Muscle

Cardiac Muscle (heart muscle)

Skeletal muscle

Skeletal Muscles are those which attach to bones and have the main function of contracting to facilitate movement of our skeletons. They are also sometimes known as striated muscles due to their appearance. The cause of this 'stripy' appearance is the bands of Actin and Myosin which form the Sarcomere, found within the Myofibrils.

Skeletal muscles are also sometimes called voluntary muscles, because we have direct control over them through nervous impulses from our brains sending messages to the muscle. Contractions can vary to produce powerful, fast movements or small precision actions. Skeletal muscles also have the ability to stretch or contract and still return to their original shape.

Skeletal muscle fibre type

Not all fibres within Skeletal muscles are the same. Different fibre types contract at different speeds, are suited to different types of activity and vary in colour depending on their Myoglobin (an oxygen carrying protein) content.

Smooth muscle

Smooth muscle is also sometimes known as Involuntary muscle due to our inability to control its movements, or unstriated as it does not have the stripy appearance of Skeletal muscle. Smooth muscle is found in the walls of hollow organs such as the Stomach, Oesophagus, Bronchi and in the walls of blood vessels. This muscle type is stimulated by involuntary neurogenic impulses and has slow, rhythmical contractions used in controlling internal organs, for example, moving food along the Oesophagus or constricting blood vessels during Vasoconstriction.

Cardiac muscle (heart muscle)

This type of muscle is found solely in the walls of the heart. It has similarities with skeletal muscles in that it is striated and with smooth muscles in that its contractions are not under conscious control. However this type of muscle is highly specialised. It is under the control of the autonomic nervous system, however, even without a nervous imput contractions can occur due to cells called pacemaker cells. Cardiac muscle is highly resistant to fatigue due to the presence of a large number of mitochondria, myoglobin and a good blood supply allowing continuous aerobic metabolism

Answer 2

Answer:

Basically muscle are classified into three types :-

Skeletal muscles :-

=>These muscles are also known as Striated muscle.

=>They have multi-nucleated and unbranched muscle cells.

=>They are under voluntary control of our nervous system and thus are the voluntary muscles.

=>Performs actions such as running, jumping, fighting that are under our will.

Smooth muscles :-

=>These muscles are also called as visceral muscles.

=>They have uni-nucleated and spindle shaped muscles cells.

=>These are not under the control of our will and are called as involuntary muscles.

=>Performs actions such as digestion, fertilisation etc that are not under our will.

Cardiac muscles :-

=>These are the muscles of the heart.

=>These are involuntary in action.

=>Arranged in a branched pattern over the heart and are uni-nucleated.