In the circulatory system heart is the key organ. Through circulatory system transport of nutrients, gases such as oxygen to the body and nitrogenous waste away from the body. Human blood circulation is a double circulation as flood flows through two routes that is one for oxygenated blood and the other for deoxygenated blood.
The parts of the circulatory system in the diagram is given below:
a. Pulmonary artery, carries deoxygenated blood to the lungs from heart.
b. Aorta, carries oxygenated blood to the body tissues from the heart.
c. Inferior vena cava, carries deoxygenated blood from body tissues to the heart.
d. Arterioles, supplies oxygenated blood to the body cells.
