2. The heart pumps blood to different parts of our body. The blood is carried to different parts of the body with the help of blood vessels. This is called circulation of blood. There is a system in our body which performs this task. The system is known as circulatory system. WHAT IS CIRCULATORY SYSTEM?

3. FUNCTION The main function of the circulatory system is to transport blood and nutrients to different parts of the body and collect the waste materials from different organs.

4. PARTS OF THE CIRCULATORY SYSTEM Heart BloodBlood vessels

5. HEART The heart is the most important part of the circulatory system. It works like a pumping machine. It pumps blood to the lungs and the other parts of the body with the help of blood vessels.

6. BLOOD VESSELS Blood vessels are of two types: arteries and veins. Blood vessels are of two types: arteries and veins. Arteries are blood vessels which carry pure blood from the heart to various organs. Arteries are blood vessels which carry pure blood from the heart to various organs. Veins are blood vessels which carry impure blood from various organs to the heart. Veins are blood vessels which carry impure blood from various organs to the heart.

7. The blood supplies food and oxygen to the different parts of the human body. It also takes in waste materials and carbon dioxide to throw out of the body. What is pure and impure blood? The blood which contains food and oxygen is called pure blood and the blood which contains waste materials is called impure blood. Blood

8. The pumping of the blood in the heart produces a ‘lub-dub’ sound. The lub-dub is the sound of our heartbeat. Doctors use a stethoscope to check the heartbeat. Ahe heart continues to beat even when separated from the rest of the body. The pumping of the blood in the heart produces a ‘lub-dub’ sound. The lub-dub is the sound of our heartbeat. Doctors use a stethoscope to check the heartbeat. As long as it receives oxygen, the heart continues to beat even when separated from the rest of the body. Did you know?