The structure and the function of the blood in the circulatory system
The blood is a red liquid , It consists of the plasma , the blood platelets , the red blood cells ( the corpuscles ) , And the white blood cells ( The corpuscles ) .
The functions of the blood
The blood transfers the materials to all the body cells , where the red blood cells carry oxygen and carbon dioxide , And plasma transports the food , the vitamins , the salts and the harmful wastes .
The blood protects the body , where the white blood cells attack the microbes that cause the diseases to the human , The blood platelets help in healing the wounds , And the blood keeps the temperature of the body constant .
The plasma is a yellow watery fluid in which all the blood components are suspended . It carries the needed food substances to the body cells , and it carries the harmful wastes that formed in the cells to get rid of them , The blood is a fluid due to the presence of the plasma which is a watery fluid .
The blood platelets
The blood platelets are the small cell fragments . It helps in the coagulation of the blood ( the formation of the blood clot ) , So they help in healing the wounds .
When the body is wounded and the blood exposed to the air , the platelets stick to prevent the bleeding and they heal the wounds .
The red blood cells ( RBC’S )
The white blood cells ( WBC’S )
The white blood cells are the white cells with the different forms of the nuclei , And they defend the body against the microbes by attacking them .