Muscle tissue, its types and functions in the human body

A tissue, which consists of leaves or a cell package (muscle fibers) that is capable of contracting and producing movement or voltage in the body is called muscle tissue.
These fabrics are usually Mesodermic in origin and consist of thin and elongated cells called muscle fibers.
Each fiber contains fine longitudinal fibrils Myofibrils.
The cytoplasm within a muscle fiber is called Sarcoplasia. Sarcoplasma contains a called membrane network Sarcoplasmic reticulum.
Each muscle fiber is externally covered by a membrane called Sarcolema.
Muscle fiber exhibits the property of:
- Irritability
- Conductivity
- Contractility
The muscles are well supplied with blood vessels that transmit them with nutrients and oxygen and eliminate metabolic waste products.
At the same time, each muscle has its own nerve supply.
There are three types of muscles in our body.

1. Striated muscles (scratches or skeletal or volunteers):

These muscles are under the control of our will, therefore, they are also called voluntary muscles.
They are long, cylindrical and unbrusted with blunt ends and are multinucleated.
Muscle fibers are arranged in packages called fasciculli and remain linked by connective tissue.
They contain an alternative disposition of dark and clear bands.
The dark band is highly refractive and is also called anisotropic band. It is formed from Myosin protein.
The light band is not fencing and is also called isotropic band that is composed of a protein called Actin.
Isotropic means something that allows light to pass and, therefore, seems lighter.
Anisotropic means that it does not allow light to pass and, therefore, seems darker.
Sarcoplasma contains many mitochondria and a large number of thread -shaped fibers, myofibrils.
These myofibrils run along muscle fibers and are parallel to each other.
Each myofibrilla contains actin filament and myosin filament. Actin and myosin slide on each other and produce muscle movements.
These muscles are attached to the skeleton in the regions of the head, the trunk and the limbs. Therefore, they are also called skeletal muscles. They are also found on the wall of the body, the tongue, the pharynx, the beginning of the esophagus, etc.
They are subjected to powerful and fast contractions. These muscles are fatigued or tired rapidly and are supplied with the central nervous system.

Functions:

2. Non -striated muscles (without stripes or visceral or involuntary):

These muscles are formed by elongated spindle -shaped cells that narrow at both ends.
They have no stretch marks or stripes. Therefore, they are called smooth or non -striated smooth muscles. They are devoid of light and dark bands.
They are not under the control of our will and, therefore, are called involuntary muscles.
Each cell consists of a large oval nucleus located in the center that is locked in a mass of sarcoplasma.
Sarcoplasma contains numerous fine longitudinal myofibrils.
There is no true sarcolema and each fiber is subject to its plasma membrane.
These muscles are found in the walls of the visceral organs such as the food channel, the blood vessels, the respiratory passage, the urinary bladder, the genital tract, etc. Therefore, they are also called visceral muscles.
They show slow but prolonged contractions and are not tired or tired.
They are under the control of the autonomic nervous system (ANS).

Functions:

It maintains blood pressure and blood flow in the cardiovascular system.
In the lungs, open and close the airways.
In the GI tract, it plays an important role in the motility of food collection and nutrition through peristalsis.

3. Heart muscles:

They are the muscles that are in the heart and are involuntary.
It consists of a network of interconnected muscle fibers.
It is structurally similar to skeletal muscles but functionally similar to smooth muscles.
Muscle cells are short, cylindrical and branched.
They also contain light and dark bands.
Each fiber is externally covered by sarcolema. The cytoplasm is not uninched and the cells are connected together using special zig-zag unions called intercalated discs.
These muscles are supplied with a central and autonomous nervous system.
They show rhythmic contractions and do not depend on nerve stimulation.
They do not fatigue and, therefore, they are called muscles without fatigues.

Functions:

They help in the beating of the heart. That is, the contraction and relaxation of heart muscle cause heartbeat.

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