1. Blood

2. Circulatory system (blood & vessels) 4 functions –1. Transportation system for body –2. Fights infection –3. Maintains water balance –4. Maintains temperature

3. What does blood do for us?

4. Transports: –Nutrients –Wastes –Body heat

5. Bloody facts Only fluid tissue 5-6 liters in healthy male 8% of body weight

6. I. Parts of blood Red and white blood cells floating in fluid called plasma

7. 4 Components A. Red Blood Cells: “Erythrocytes” Transports oxygen Make up 45% of blood  called “hematocrit”

8. A. Erythrocytes (RBC’s) no nucleus donut shape Major factor in blood thickness

9. More bloody facts RBC’s: –Cannot multiply (why?) –Fall apart in 100-120 days –Remains gotten rid of by spleen and liver No nucleus

10. RBC’s continued Hemoglobin: What is it?

11. Hemoglobin Iron containing protein, transports O2, can also bind to carbon dioxide and carbon monoxide

12. Don’t write this slide! 1 RBC contains ~250 million hemoglobin molecules Each h-molecule can bind 4 Oxygen molecule. 1 RBC can carry ~1 billion oxygen molecules!!

13. B. Leukocytes: White blood cells -protects body -~1% of blood

14. Able to leave blood vessels unlike RBC’s. Function: can locate areas of damage by responding to chemicals. Moves by ameoboid motion

15. Total WBC count is used to indicate infection- have more if you are sick

16. C. Platelets: cell fragments - used in clotting -~1% of blood

17. D. Plasma: non-living fluid - 55% of blood

18. components

19. What makes blood red?

20. Amount of oxygen it carries - Bright red when lots of oxygen - Dull red when little O2

21. Where does blood come from?

22. Hematopoeisis: blood cell formation Occurs in red marrow

23. In adults, blood formed: Flat bones of skull and pelvis Ribs, sternum Ends of long bones

24. The end!!