Answer:
Explanation:
Blood is an essential part of the circulatory system in the human body. The main function of blood is that it helps to transport materials to different parts of the body where they are need. Blood helps carry waste materials of metabolism from where they are produced to the excretory system. It helps carry oxygen round the body system and it takes out carbon dioxide that is not needed by the body.
Some part of the blood sees to fighting foreign bodies in the system. They are called whiteblood cells. There is no immune system without the white blood cells.
