1. Circulatory System

2. What is the function of the Circulatory System?

3. Blood Vessels: Arteries

4. Blood Pressure:
systolic pressure- when the ventricles contract
diastolic pressure- when the ventricles are relaxed
Hypertension- high blood pressure!

5. Capillaries

6. Veins

7. Your Heart

8. Chambers of the Heart

9. Heartbeat Control
Sinoatrial Node (SA Node) located in the right atrium. Also called the ‘pacemaker’ for the heart.
Initiates an electrical impulse and contracts.
Impulse travels to the atrioventricular node (AV Node).
Found in the septum.
Causes the ventricles to contract.

10. Flow of Blood

11. Patterns of Circulation
Pulmonary Circulation- blood traveling between the heart and lungs. -pulmonary veins
Systemic Circulation- blood traveling between the heart and other body tissues. -coronary circulation -renal circulation hepatic portal circulation

12. Lymphatic System
Functions in returning fluids that have collected in the tissues to the bloodstream.
Fluid is called lymph.
Lymph nodes store lymphocytes, type of white blood cell that are specialized to fight disease and infection.

13. Blood
Plasma- liquid part of the blood, mostly water. Carries nourishment for the cells.
Red Blood Cells (erythrocytes)- transport oxygen. Formed in the red marrow of cells.
Hemoglobin- transports O2 and CO2 -no nuclei
-life span of days

14. White Blood Cells (leukocytes)- help defend the body against disease
White Blood Cells (leukocytes)- help defend the body against disease. -formed in the red marrow, lymph nodes, and spleen.
-larger than RBC’s
-can live many years

15. Platelets- help form blood clots
Platelets- help form blood clots. -Fibrin (protein) is produced that forms a sticky web, forming a clot.
Blood Types- A, B, O, AB
-Antigens- protein or carbohydrate that signals the body that something foreign has entered it.
-Rh factor- antigen present on the surface of RBC’s. Majority of humans are Rh +.