Structure and function of 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, vitamins, salts, and harmful wastes.
The blood protects the body, where the white blood cells attack the microbes that cause diseases to the human, The blood platelets help in healing wounds, and the blood keeps the temperature of the body constant.
The plasma
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 fluid due to the presence of 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 is exposed to the air, the platelets stick to prevent the bleeding and they heal the wounds.
The red blood cells (RBC’S)
The red blood cells are the red cells without nuclei. They carry oxygen gas from the lungs to all the body cells, and they carry carbon dioxide gas from all the body cells to the lungs.
The white blood cells (WBC’S)
The white blood cells are the white cells with different forms of nuclei, and they defend the body against the microbes by attacking them.
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