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  • 1. The Heart and the Blood. Why are they important?
  • 2. The Circulatory System • This is the circulatory system of the human body. • Arteries are shown in red, veins in blue. The heart is in the middle of the chest.                                                                                                              
  • 3. The Blood • Here are three types of blood cells viewed under a scanning electron micrograph microscope. • You can see red blood cells, white blood cells and, shown in blue, platelets.                                                                                                              
  • 4. The Heart • The heart is a muscle. • It pumps blood around the body. • Your heart is about the size and shape of your fist.
  • 5. The Heart • Blood is the body's delivery and collection service. • It delivers food and oxygen to every part of the body, and it collects waste products, particularly carbon dioxide. • Blood circulates, or goes round and round your body, about 2000 times a day. It is pumped by the heart through tubes called blood vessels.
  • 6. Inside the Heart • When a heart is cut open, you can see a thick wall down the middle, dividing it up into two halves – a left and a right side. • The heart is really two pumps working side by side. Each pump has a top space, or atrium, which receives blood from the veins. Below each atrium is another space, a ventricle, which pumps blood out of the heart and into arteries.
  • 7. The Structure of the Heart 1. valve 2. Right atrium 3. valve 4. Right ventricle 5. aorta 6. Left atrium 7. valve 8. Left ventricle 9. septum