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Study guide questions: Chapter 42:

Important terms: Cardiac cycle, systole, diastole, cardiac output, heart rate, stroke volume, heart murmur (page 903); the sinoatrial (SA) node (pace maker) (page 904); vasoconstriction, vasodilation (page 907); hemoglobin (page 911, also 924), heart attack, stroke, hypertension, etherosclerosis (pages 913-915).

1. Distinguish between a) open and closed circulatory systems; b) single and double circulation; c) pulmonary and systemic circuits (Pages 889-901).

2. Coordinated cycles of heart contraction drive double circulation in mammals. De-oxygenated blood from the body enters the heart, which is then pumped to the lung to be oxygenated. The newly oxygenated blood enters the heart and then pumped to the whole body. Use the structures given below to describe the direction of blood flow. Start with the first structure that takes the de-oxygenated blood to the heart and end with the last structure that takes the oxygenated blood to the body (Pages 902, Fig 42.6). Left semilunar valve, right semilunar valve, left AV valve, right AV valve, left ventricle, right ventricle, left atrium, right atrium, pulmonary arteries, pulmonary veins, aorta, lungs, the superior/inferior vena cava.

What specifically does each of the four valves of the heart do?

3. What percentage of the brains blood supply arrives from the hearts right half?

4. Label the figure given below (page 903, Fig 42.7). [pic]

5. In vertebrates, the heartbeat originates in the heart itself. What maintains the heart’s rhythmic beat? Why is it important that the AV node delay an electrical impulse moving from the SA node and the atria to the ventricles? Why is it that the hearts tempo changes under different circumstances, for example when we sit and relax, when we walk, when we have fever? (Page 904).

6. Contracting ventricles

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