1. The Circulatory System: Blood

2. The components of blood
55% Plasma (clear yellowish fluid)
contains water, proteins, minerals, salts
<1% White blood cells, platelets
45% Red blood cells

3. The components of blood

4. Red Blood Cells
Shape
red biconcave discs (flexible to squeeze through capillaries)
no nucleus & organelles
(produced in bone marrow, liver, spleen)

5. Red Blood Cells
Function
Carry O2 (to cells)
& CO2 (to lungs)

6. White Blood Cells Shape larger than RBC’s colourless, spherical
Irregular shaped nuclei

7. White Blood Cells
Function
fight infection
and growth of cancer

8. Platelets
Shape
irregularly shaped cell fragments

9. Platelets Function helps blood to clot
(thickens blood and allows scab to form)