1. Circulatory System Blood Lymphatic System

2. The Heart & Blood flow

3. Superior Vena Cava Inferior Vena Cava Right Atrium Right Ventricle Left Atrium Left Ventricle Septum Aorta Pulmonary Arteries Pulmonary Veins Semilunar Valve Tricuspid Valve Bicuspid Valve

4. From Body To Lungs To Body From Lungs

7. 1) Sinoatrial (SA) node 2) Atrioventricular (AV) node Conducting fibers Contraction of Atria Contraction of Ventricles Section 37-1 The Pacemaker

10. System Circuit Pulmonary Circuit

11. Circulatory System Pulmonary Circulation –Carries blood between the heart and the lungs only Systemic Circulation –Carries blood between the heart and the rest of the body, except for the lungs

12. Capillary VeinArtery ArterioleVenule

13. Blood Vessels Arteries: carry O 2 - & nutrient-rich blood away from the heart to body (arterials-small arteries) Veins: carry CO 2 - & waste rich blood back from body towards the heart (venules-small veins) Capillaries: where nutrients, gases, & wastes are exchanged with the body; located b/w arteries & veins

14. Capillary VeinArtery Connective Tissue Smooth Muscle Epithelium Valve

18. Transports raw materials (from digestion) to the cells Removes waste from cells –Brings wastes to kidneys, lungs, & skin Maintains a fluid environment for the cells Protects the body from disease Keeps body pH stable Prevents further blood loss Blood’s Role

21. Blood Composition

22. Erythrocytes: RBC’s; carry Oxygen/Carbon Dioxide using hemoglobin (~45% of blood) (circulate up to 120 days) Leucocytes: WBC’s; body defense (<1% of blood) (circulate under 1 day) Platelets: involved in clotting (<1% of blood) (circulate 3-8 days) Plasma: liquid where gases/nutrients are dissolved (~55% of blood) Blood Composition

23. Section 37-2 RBC’s WBC’s Platelets Plasma

25. All of our cells are bathed by fluids that diffuse out of the capillaries This system collects these fluids and proteins and returns them to the blood Lymph nodes return fluids & proteins to the blood, plus have WBC’s to help protect the body from disease or cancer-causing cells Lymphatic System

26. Circulatory System