IGCSE - The heart

Only the summary of the basic function of the heart. - Recommended for grade 8 to IG year 1

1. Transport in humans MADE BY: SACHU

2. Mammals have 2 circulatory systems The main transport system of all mammals is the blood transportation system which is also known as the circulatory system. The circulatory is made up of tubes that transports blood these tubes are called blood vessels. The heart keeps the blood flowing through the vessels.

3. Layout of the circulatory system The diagram illustrates the general layout of the human blood system. Those arrows shows the direction of the blood flow. If you follow the arrows beginning at the lungs, you can see the blood flows into the left-hand side of the heart, and then out to the rest of the body. It is brought back to the lungs again.

4. Blood becomes oxygenated and deoxygenated The blood that contains oxygen (the pure blood) in other words it is called oxygenated blood. The blood that contain the waste materials of cell (CO2) is known as deoxygenated blood.

5. THE HEART The function of the heart is to pump the blood. It is made up of cardiac muscle. The muscle contracts and relaxes regularly. The two upper chambers are atria. The two lower chambers are ventricles. The two sides are completely different they are divided by septum

6. QUESTION? What will happen if there was no septum? Any questions from your side ????