1. Circulatory System

2. Functions: Carries oxygen and nutrients to organs and tissues Carries oxygen and nutrients to organs and tissues Transports away carbon dioxide and other waste products Transports away carbon dioxide and other waste products Regulates body temperature Regulates body temperature

3. Components: a. Heart - 4 chambers: 4 chambers: left and right atria, left and right ventricles left and right atria, left and right ventricles

4. Components: b. Blood - Red blood cells (rbc): oxygen rich Red blood cells (rbc): oxygen rich White blood cells (wbc): disease fighting cells White blood cells (wbc): disease fighting cells Platelets: blood clotting Platelets: blood clotting Plasma: a yellowish liquid that contains platelets, rbc, wbc, waste products and other substances Plasma: a yellowish liquid that contains platelets, rbc, wbc, waste products and other substances

5. Components: c. Blood vessels- Arteries: carry blood away from heart; have thick walls to withstand pressure from the heart Arteries: carry blood away from heart; have thick walls to withstand pressure from the heart Veins: carry blood towards heart; have one-way valves to prevent blood from flowing back Veins: carry blood towards heart; have one-way valves to prevent blood from flowing back

6. Components: c. Blood vessels- Capillaries: link arteries and veins; thin enough to allow diffusion of oxygen and nutrient; 10 vessels side by side equal the size of a human hair Capillaries: link arteries and veins; thin enough to allow diffusion of oxygen and nutrient; 10 vessels side by side equal the size of a human hair

7. Cardiovascular Diseases: a. Atherosclerosis – plaque in the artery walls reduces blood flow; caused by high cholesterol a. Atherosclerosis – plaque in the artery walls reduces blood flow; caused by high cholesterol

8. Cardiovascular Diseases: b. Hypertension- elevated blood pressure resulting from an increase in the amount of blood or due to blood pushing through narrow openings; after some time heart thickens

9. Cardiovascular Diseases: c.Arteriosclerosis- hardening of the arteries; loss of arterial elasticity; impairs circulation; heart has to work harder to deliver blood