2. Main blood vessels
Arteries
 Capillaries
 Veins

3. Arteries
- the walls are smooth which contract &
relax .
- transport blood away from heart .
- transport oxygenated blood from
arteries to capillaries . ( arterioles )

4. Capillaries
- tiny blood vessels .
- supplied with blood by arterioles .
- 1 cell thick .
 exchanges material between capillary
& surrounding tissue .
- supply tissues & to remove waste .
- exchange of oxygen , carbon dioxide ,
water & salts .

5. Veins
- consists of 3 layers of tissues .
- include valves which helps the return of
blood to the heart by which prevents blood
from flowing in the opposite direction .
- transport blood towards the heart .
- transport deoxygenated blood .

6. Transport nutrition
Transport respiratory gases
Transport hormones and enzymes from their
place of origin
Blood clotting
-prevent loss of blood cells and body fluid
Defend the body against the invasion of micro-
organisms
Remove all waste product from tissues and cells

7. Plasma
 Red blood cells
 White blood cells
 Platelets
 Immunoglobulins

8.  Plasma
- carries dissolved substances & transports them to the
organs & tissues in the body .
dissolve substance
; glucose
; digestion
; hormones
; vitamins
; urea
; carbon dioxide

9. Red Blood Cells
- replace heavy blood loss .
- transport oxygen to the heart .
White Blood Cells
- fights infection & part of the body’s defense
system .
- part of immune system .
Platelets
- stop blood from gushing / flowing out of the
injured area .

11.  Immunoglobulin
- protective antibodies , generated by white
blood cells .
 form when someone is recovering /
received some immunization .
 protect someone against future attack of
the infection
- Specific immunoglobulin has special
selected antibodies to treat a specific
infection .

13. □ www.google.com.sg ( information )
□ www.google.com.sg/images ( photos )