1) Which best describes why the both pulmonary and the aortic semilunar valves o

Question

1) Which best describes why the both pulmonary and the aortic semilunar valves open and shut?

a) muscles on atrial side pulling the valves to move them

b) muscles on ventricular side pulling the valves to move them

c) changes in blood pressure in the atria and the respective blood vessel

d) changes in blood pressure in the ventricles and the respective blood vessel

e) changes in blood pressure between the two chambers

11) For the newly-discovered Tiny Armadillo mammal, per min flow is 120 and volume ejected per heart beat 10 mL. What is Heart Rate?

12        b. 120                    c. 100              d. 1200

Explanation / Answer

1)ans is d

It's the change in blood pressure in the ventricles and the respective blood vessel which cause the pulmonary valves and aortic semilunar valves to open and shut

11)per min flow=heart rate *stroke volume

120 =heart rate*10

So heart rate is 12

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