1. Done By : Ginnie , Julia , Sheng Jie & Brandon

2. Main blood vessels connected to the
heart
 Arteries
 Veins
 Capillaries

3. Contains 3 layers
• An outer layer of tissue
Arteries
• A muscular middle – elastic and very strong
• An inner layer of epithelial
(tissue that covers a surface ) cells
- smooth so that blood can flow easily with no
obstacles in its path
• Carry blood away from the heart
• Contains blood under high pressure

4. Veins
Carry blood to the heart
Have valves to prevent blood flowing backwards
Transport blood at a lower pressure
Have thin layers of walls
Transport waste-rich blood back to the lungs
and heart

5. outer layer
muscle layer
elastic layer
valve
inner layer

6. Capillaries
Microscopic – one cell thick
Found in the muscles and lungs
When gas exchange takes place, oxygen
passes through the capillary wall and then
into the tissues, carbon dioxide passes
from the tissues into the bloodstream and
transport back to the heart.

8. Blood
Blood
 Transport food , oxygen , water and
mineral salts throughout the body.
 Carry away carbon dioxide & waste
products
 Helps keep body at the right temperature

9.  Carries hormones to the body’s cell
 Sends antibodies to fight infection
 Hemoglobin from red blood cell helps carry
oxygen throughout the lungs, the excess
carbon dioxide is then exhaled through the
lungs

10. Platelets
Platelets
• Clump together to form clots
• Clotting stops the blood from
flowing out of the body when a
vein or artery is broken.

11. White Blood Cell
• An important part to the
immune system
• They produce antibodies
and destroy harmful micro-
organisms

12. Fun Facts
Fun Facts!!
Did you know ?
If you took all of the blood vessels
out of an average child, and laid
them out in one line, the line
would be over 60,000 miles long!
An adult’s vessels would be closer
to 100,000 miles long!

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