Healthy bodies part 1

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8. Heart disease can be caused by worry,smoking and diet

9. Know that we can be protected from disease by immunisation.

Slide 20

Heart and Blood.

You may also know that :-

1. There are three types of blood vessel,namely veins,arteries and capillaries.

2. Exercise affects your pulse rate.

3. Blood consists of plasma,red cells,white cells and platelets.

Slide 21

The Heart.

1. The right side of the heart takes blood from the body and pumps it to the lungs.

2. The left side of the heart takes blood from the lungs and pumps it to all parts of the body.

Slide 22

Arteries veins and capillaries.

Slide 23

Blood Vessels.

1. An artery is a vessel which carries blood away from the heart.

2. It has a thick muscular wall.

3. The blood travelling in the artery is under great pressure.

4. The high pressure is caused by the heart beat.

Slide 24

Capillaries and Veins.

1. The arteries divide into smaller vessels called capillaries.

2. The capillaries join up to form larger vessels which in turn form veins.

3. The veins carry blood back to the heart.

4. The veins are under less pressure than the arteries.

5. Veins have no pulse and are found nearer the surface than arteries.

Slide 25

Valves.

1. The pressure has dropped by the time it reaches the veins.

2. To prevent blood from flowing backwards,the veins have valves.

3. Valves are like doors which only open one way.

Slide 26

Blood Composition.

Blood is made up from

1. Red blood cells.

2. White blood cells.

3. Platelets.

4. A white liquid called

plasma.

Slide 27

Red blood cells.

These cells are the carriers of oxygen round the body.

The chemical called haemoglobin makes the blood red.

Slide 28

White blood cells.

1. These cells are responsible for building up immunity to disease.

2. They build up antibodies which fight against various infections we get.

Slide 29

Platelets.

The platelets are the cells which cause clotting at the sight of an injury,thus helping healing of wounds.