Many substances like water, oxygen, soluble food material, and waste products are exchanged between the parts of the body. To facilitate this exchange these substances have to be transported. The function of transportation is carried out by the circulatory system.
BLOOD:-
Blood is the fluid connective tissue in human beings. It carries out the function of transport of various materials in the body. A Pumping organ is needed to push the body around the body along with a network of tubes to reach all the tissues and a system to repair the network from time to time if it is damaged. The volume of the blood in an average adult as 4.7 liters.
BLOOD:-
Blood is the fluid connective tissue in human beings. It carries out the function of transport of various materials in the body. A Pumping organ is needed to push the body around the body along with a network of tubes to reach all the tissues and a system to repair the network from time to time if it is damaged. The volume of the blood in an average adult as 4.7 liters.
FUNCTION OF THE CIRCULATORY SYSTEM:-
The soluble substances produced in the digestive system are absorbed by the blood and get dissolved in its water content. These dissolved food materials are then supplied to all cells in the body through the blood.
Once oxygen from the air enters the body it, too, is absorbed by the blood and supplied to all cells through blood. Chemical like hormones, which are essential for life processes also enter the blood. blood transport them to all cells.waste products from all cell are transported to the excretory system by blood, to be expelled from the body.
THE STRUCTURE OF THE CIRCULATORY SYSTEM:-
In higher animals and man, there is a separate system meant for the circulation of blood. This is closed system and consist of the heart, blood vessels and capillaries.

HEART - The involuntary pump:-

- The body temperature of the cold blooded animals varies according to environmental temperature. Such animals can tolerate some mixing of oxygenated and deoxygenated blood. such animals have three chambered heart e.g. amphibians and many reptiles.
- fish have only a two chambered heart so blood through the heart only once.
- There are about 97000 kilometer of blood vessels in the human body.
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