7. In what phase is the cardiac eycle when the semilunar valves are open and AV

Question

7. In what phase is the cardiac eycle when the semilunar valves are open and AV valves are closed? A) atrial contraction B) ventricular filling C) isovolumetric contraction D) isovolumetric relaxation E) ventricular ejection 8. In what phase is the cardiac cycle when the semilunar valves are closed and the AV valves are open? A) atrial contraction B) ventricular filling C) isovolumetric contraction D) isovolumetric relaxation E) ventricular ejection 9. Which of the following equations correctly relates flow, pressure, and resistance? A) Flow = pressure x resistance B) Resistance = flow x pressure C) Flow pressure+ resistance D) Flow = pressure ÷ resistance 10. The contractile activity of smooth muscle cells within which type of blood vessel is primarily involved in the control of the organ blood flow and mean arterial pressure? A) arterioles B) capillaries C) arteries D) venules E) veins 11. The elastic nature of the largest blood vessel's walls allows them to act as a , maintaining the driving force for blood flow while the heart is relaxed during diastole. A) volume reservoir B) non-distensible structure D) pressure reservoir E) contractile force 12. Blood flow through the systemic circulation is intermittent; flowing during systole and pausing during diastole. A) True B) False

Explanation / Answer

7 . E ventricular ejection

8. A . Atrial contraction during atrial systole AV valves open semilunar valve closed

9. D. Flow equal to pressure bivideby resistance

10. A arterioles

11.D pressure reservoir

12 false

13.c

14c elevate the mean atrial pressure

15. B it is compare of red blood cells and plasma to the total blood cells

16 a

17 true

18 e lymphocyte

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