HUMAN BODY

 The human body :

    Although they are all different, living beings are made up of the same elements. The human body is an assembly of billions of cells. Those who perform identical tasks band together in cloth to do their work .Thus, there are four types of main fabrics:

 

 ● Epithelial tissue: >> forms the skin and hollow structures like the mouth.

 

 ● Connective tissue: >> supports the body, like bones and fats.

 ● Nervous tissue: >> transmits electrical singals.

 ● Muscle tissue: >> moves the body.

    Tissues combine to form organs, grouped into "bone, hair, muscle, nervous, circulatory, hormonal, immune, digestive, respiratory, urinary and reproductive" systems or apparatuses "

>>> Together they form the human body .

Cell division :

    Without it, growth would be impossible. All human life begins with a single cell that divides into two identical cells between them and the mother cell (this is called "mitosis"), whose chain division allows the creation of billions of cells in the body . This process, called mitosis, continues beyond the growth period to replace old worn out cells.

The blood :

    Each tissue in the body is made up of a group of similar cells working together.

 These cells produce intecellular material that unites them. Elastic in the cartilage, hard in the bones, it takes a fluid form in the blood : plasma. Indeed, this liquid where billions of cells float, transport materials and fight infections.

 The red color of the blood is due to the presence of a protein called HEMOGLOBIN.

The main organs :

    Thanks to modern technology, amazing 《scanner, MRI》 processes cut out the human body, so doctors can 'see' the inside. So, we are able to see well the long bones of the skeleton, the main muscles, as well as the main organs of several systems / apparatus of the body : the brain "nervous system", the lungs "respiratory system", the liver "digestive system. ", kidneys and bladder" urinary tract ".

Transmission links :

    The billions of nerve cells (neurons) in the brain, some of which are responsible for carrying electrical signals across the nervous system at high speed, a vast network of communication. The brain receives information from the sensors, and immediately sends its instructions back to the muscles and glands. It thus controls the movements and functioning of the body.

The frame of the body :

    The skeleton supports the body. It allows him to make movements as soon as the muscles pull on the bones and it protects the internal organs.

   Skeletal bones owe their strength to a material called the matrix, which is made up of mineral salts and hard collagen. Other elements of the bone system include : 

   The bonds that bind the bones together.

   The elastic cartilages that cover the ends of the bones, and also form the framework of the nose and ears.

A reserve of fat :

Under the skin is a layer of fat : >> adipose tissue.

 Each of its cells is filled with a drop of oil. So any fat eaten but not used by the body is stored in this tissue, just like the fat made by the body. The fat being very rich, this layer is a reserve of vital energy for the body; it also helps it to retain its heat, and protects certain organs against blows and shocks.

 》 The body is made up of billions of cells. In fact, every minute, 3 billion used cells are replaced.

To sum up, here you have the most 5 important organs in the human body :