1. Components of Blood Circulatory System

2. Circulation

3. Types of Blood Vessels Arteries –Carry blood away from the heart –Have thick, muscular walls –Branch out into arterioles –Largest artery = Aorta

4. Veins (Contain valves – prevent backflow) –Carry blood back to the heart –Have thinner walls (less muscle) –Veins branch out into venules –Largest vein = Vena Cava

5. Capillaries –Connect arterioles to venules –Extremely thin walls (allow oxygen & carbon dioxide to pass through)

6. Components of Blood 1.Red blood cells (RBC) 2.White blood cells (WBC) 3.Plasma 4.Platelets (Thrombocytes)

7. Plasma –Made of mostly water –Transports nutrients, hormones, proteins, salts, & enzymes –Suspends solid components of blood

8. Types of Blood Cells Erythrocytes –RBCs –Carry oxygen to body cells / Return carbon dioxide to the lungs –Contain hemoglobin Heme = Iron compound Globin = Protein molecule

9. Leukocytes –WBCs –Fight infection –5 types of WBC

10. Thrombocytes –Known as platelets –Purpose is to clot RBC together –When a vessel is cut, platelets collect @ the site to form a sticky plug (then form scab)

11. Platelets

12. Types of WBC Neutrophils Most numerous Destroy bacteria (surround & consume = phagocytosis) Eosinophils Destroy parasites (release toxin to kill) Defends against allergic reactions

13. Basophils Produce histamine; participates in body’s inflammatory response Monocytes Destroy bacteria & foreign materials (dead cells) Largest type of WBC

14. Lymphocytes (Special type) Can multiply in tissues of tonsils, spleen, lymph nodes T-Cells (Helper T / Killer T) & B –Cells (create antibodies) T and B Cells fight viruses Protect against cancer cells

15. Circulation Facts About 4 to 6 quarts of blood in the average adult. Heart circulates the body’s blood supply about 1,000 times each day. At age 70, the heart has beat about 2 ½ billion times. Plasma is 90% water RBC / WBC / Platelets are made in the bone marrow