1. Weds. March 9 What are the 3 layers of the heart wall? What is the name of the Sac that surrounds the heart?

2. March 9-Answer 3 layers of the heart wall The Pericardium forms the sac (“Pericardial Sac”)that surrounds the heart. It is filled with fluid to reduce friction from other tissues/organs during heart pumping.

3. thur. March 10 Name the 4 chambers of the heart Which heart chamber contracts with the most force? Why?

4. thur. March 10 4 chambers of heart = L/R atrium, L/R Ventricles Left Ventricle contracts hardest! Left has to pump blood to entire body! (See diagram)

5. March 11 – March 21….No Warm-up Questions (family leave)

6. Tues. March 22 Where do the coronary arteries that nourish the myocardium arise from? (Hint: it carries oxygenated blood to rest of body)

7. Tues. March 22-answers The coronary arteries branch off the 1 st part of the aorta!(as soon as blood leaves left ventricle) In this view, hidden by pulmonary trunk.

8. weds. March 23 How do the atria of heart contract…together, alternate? How do ventricles contract…together or alternate? Answer…Atria contract together (send blood into ventricles); THEN the ventricles will contract (pump blood to lungs/or body)

9. Thurs. March 24 Blood pressure lab What is the average BP? 120/80 Why is BP important? Can have serious health effects long term…kidney damage, blurred vision (damage to capillaries in eyes). Most importantly…stresses the arterial walls due to constant high pressure…causes cracks in walls of arteries. Cracks can become areas for fatty deposits(fatty plaques)…plaque build up leads to Heart attack.

10. Fri. march 25 What is the proper name of the heart’s “pacemaker” What is the heart doing during “Systole”? …………..during “Diastole”?

11. Fri. march 25 What is the proper name of the heart’s “pacemaker”? ….. Sinoatrial node What is the heart doing during “Systole”? contracting …………..during “Diastole”? Relaxing