3. 1. What is the circulatory system? A. The body's breathing system B. The body's system of nerves C. The body's food-processing system D. The body's blood-transporting system 2. Label as many components as possible in the heart diagram. (we will do this in our notes) (we will do this in our notes) 3. Name the artery that supplies the heart muscles with blood. coronary artery 4. The _____ valve lies between the right atrium and right ventricle. A. right semilunar valve B. left semilunar valve C. right atriventricular valve D. left atrioventricular valve 5. Vasodilation is when ______. A. muscles expand B. blood vessels expand C. muscles shrink D. blood vessels shrink 6. The smallest blood vessels are _______-. A. capillaries B. arteries C. veins

4.  A pair of side by side pumps that work simultaneously  Each side contains: › An ATRIUM; on top, a thin- walled collection chamber for blood moving in slowly from the veins › AVENTRICLE; thick-walled muscular pump that sends blood out of the heart

5.  The goal of the transport system is to take deoxygenated blood to the lungs to get re- oxygenated and then return that blood to the heart so that it can be pumped out to the rest of the body

6.  Path of deoxygenated blood around the right side of the heart and lungs: › deoxygenated blood enters from the vena cava › into the right atrium (through right atrioventricular valve) › down to the right ventricle (through right semi- lunar valve) › To lungs via pulmonary artery › Blood gets re-oxygenated in lungs › Oxygen-rich blood returns to heart via pulmonary vein

7.  Path of oxygenated blood around the left side of the heart and then out to the body: › Left atrium (through left atrioventricular valve) › Down to left ventricle (through left semilunar valve) › Out to body via aorta › To body tissues/cells (each complete circuit around the body pulmonary + systemic takes about 1-2 minutes)

8. Let’s Review our Heart Diagram Let’s Sing! Right atrioventricular valve Right semilunar valve left atrioventricular valve Left semilunar valve

9. 1. Right and left atrium (small) 2. Right and left ventricle (larger) 3. Right atrioventricular valve 2. Left atrioventricular valve 3. Right semilunar valve 4. Left semilunar valve 5. Vena cava 6. Aorta 7. Pulmonary artery 8. Pulmonary vein NOTE: Muscle walls should be thinner on right side and thicker on left side

10.  Children can be born with congenital heart defects and adults can develop heart valve disease (discovered via heart murmurs) › Common Valve Issues  Regurgitation - backflow when the valve does not close tightly  Stenosis – the valves thicken and stiffen and prevent valves from fully opening  Atresia – heart valves lack an opening

11. Left av valve prolapse atresic right av valve stenosis