Rakesh Garhwal

Circulatory system "Circulation means" anything which moves around. The system that contains the heart and the blood vessels and moves blood throughout the body . This system helps tissues get enough oxygen and nutrients, and it helps them get rid of waste products. Circulatory system is of two types  1. open circulatory system-  where there is no blood vessels involved ex- cockroach and 2. closed circulatory system like human being where blood vessels supplies the blood to other organs. This system consists 3 organs 1. blood  2.blood vessels  And most important 3. heart Blood vessels are further divided into two parts  1. arteries 2.veins The discovery of blood circulation system was done by William Harvey. Points to remember: Biological term of the heart is ‘Cardio’. Doctor Who study heart is called cardiologist our heart consist four Chambers  And is of a size of closed fist Atrium are the upper parts and ventricles are there a lower parts heart. It remains safe in the per