When the atria are contracting you would expect:Question 2Select one or more:a.The atrioventricular valves to be open.b.Pressure in the atria to be higher than the pressure in the ventricles.c.The semilunar valves to be open.d.Blood to be moving from ventricles to atria.e.The ventricles to be in diastole.
Question
When the atria are contracting you would expect:Question 2Select one or more:a.The atrioventricular valves to be open.b.Pressure in the atria to be higher than the pressure in the ventricles.c.The semilunar valves to be open.d.Blood to be moving from ventricles to atria.e.The ventricles to be in diastole.
Solution
When the atria are contracting, you would expect:
a. The atrioventricular valves to be open: This is true. The atrioventricular valves, which include the mitral and tricuspid valves, allow blood to flow from the atria to the ventricles. When the atria contract, these valves open to allow this flow.
b. Pressure in the atria to be higher than the pressure in the ventricles: This is also true. When the atria contract, they are pushing blood into the ventricles. This action increases the pressure in the atria, making it higher than the pressure in the ventricles.
c. The semilunar valves to be open: This is false. The semilunar valves, which include the aortic and pulmonary valves, prevent the backflow of blood from the arteries into the ventricles. They open when the ventricles contract, not when the atria contract.
d. Blood to be moving from ventricles to atria: This is false. When the atria contract, blood is pushed from the atria into the ventricles, not the other way around.
e. The ventricles to be in diastole: This is true. Diastole is the phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood. When the atria are contracting (atrial systole), the ventricles are in diastole, filling with blood.
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