What are muscles

Muscle concept
The concept of muscles refers to a complex network of soft tissues that exist throughout the human body. The muscles in the human body have many functions, the most important of which is movement. The skeletal muscles in the human body are linked to the skeleton that moves by moving the bones. Some muscles are intricately linked to the skeleton and help the body to take certain positions such as standing and sitting, and muscles play a vital role in maintaining the body's natural temperature of 37 degrees Celsius.


Characteristics of muscles

• Systole: The most prominent characteristics of the muscles that they contract strongly with each other, which helps to contract easily, and it gives the body a large drag.

• Tension : the muscle tissue allows the body to extend any member of the body .

• Flexibility: Muscle after the tide can be easily folded and easily grasped

• These are signals and factors that stimulate muscle cells to release electrical impulses that travel along the plasma membrane in cells. These impulses stimulate muscle cells to contract.

Muscle structure

SCAROPLASMA

The bone is composed of muscle muscles, each of which is a cellular bundle. Each cellular bundle is called a muscle fiber. It is made up of a substance called cytoplasm. It is a cellular membrane that surrounds the protoplasm connected to the ends of the fibrous tissue. This tissue is called the inner muscle. Each group of muscle fibers is surrounded by a membrane separated from the other. Muscle groups, and also surrounds the muscle of another membrane above the muscle is the function of reducing muscle friction during movement.
Motor unit
Is the functional unit of the muscle, and consists of: a neuron, nerve fibers that get their food from the cell, and the nerve, whose body is located in the central nervous system, and comes out of the center axis enters the muscle with a group of other axons, and after the arrival of the muscle graduated from Neurons are additional branches so that each muscle fiber has a nerve fiber feeding it.

The nerve fibers end up with a motor plate that is somewhat similar to the electrode, and these plates act to transfer neurotransmitters from nerve fibers to sclerosis.
Types of muscles
The human body contains 600 muscles distributed throughout the body, and make up 40% of the total body weight of the body, and muscle types including:

• Voluntary muscles: the muscles controlled by the human as moving the head, and move the hands.

• Muscle: A muscle that moves without the effort of a human being, ie, it receives orders from the central nervous system as the generation of heat needed to heat the body.

• Cardiomyopathy: A muscle that works in both voluntary and involuntary directions. It is the most important muscle in the human body as it is the first and last responsible for its life.