2. Function of Blood Transports gasses, nutrients, molecules, hormones, and waste products Regulates pH Maintains body temperature Protection against foreign substances Clot formation

3. Composition of Blood Blood is a type of connective tissue, made of formed elements (cells) and plasma (liquid) Total Blood Volume = (women) 4-5 liters (men) 5-6 liters

4. How They Make a Sample

5. Plasma Plasma makes up 55% of a blood sample Plasma contains 91% Water 7% Proteins 2% Other Stuff

6. Formed Elements

7. Hematopoiesis

9. Red Blood Cells Red blood cells are the most numerous of the blood cells Biconcave disks Produced from cells in bone marrow Hemoglobin gives red blood cells their color Red blood cells stay in circulation for 120 days before being destroyed by white blood cells

10. White Blood Cells White blood cells are produced in bone marrow Larger than red blood cells and are colorless (white) no hemoglobin Function is to protect the body against foreign invaders by digesting them and destroying them.

11. Platelets and Blood Clotting Platelets are fragments of other cells Platelets help the clotting process by clumping together and plugging up a site of a wound. Clotting is not always a good thing. Sometimes a small clot will form and block a blood vessel completely. (Blood clot to the brain could cause a stroke.)