1. BLOOD

2. Function of Blood? To carry nutrients and oxygen to cells.
To carry carbon dioxide and other waste products from cells.

3. Parts of Blood Plasma = liquid portion (55%) Blood Cells (45%):
Erythrocytes (RBC’s)
Leukocytes (WBC’s)
Thrombocytes (Platelets)

4. Erythrocytes (RBC’s) Made of Red Marrow of our bones.
Constantly being made.
They live for about 4 months and die.
They are removed by the spleen.
Contain red pigment called hemoglobin.

5. Leukocytes (WBC’s) Larger and fewer than RBC’s. Made in bone marrow.
Live for years.
“Fighters of disease”
Help to form pus (combination of dead invading cells and WBC’s)

6. How do Leukocytes fight disease?
Phagocytes = engulf unwanted organisms.
Antibodies = substance that destroys the organism.

7. Thrombocytes (Platelets)
Fragments of cells that are released from marrow.
Cause blood to clot using fibrin (a network of threadlike material that plugs the torn area.)