what causes the aortic semilunar valve to close

Chapter 12

Cardiac cycle

 

1.      During which phase of the cardiac cycle are the atrioventricular, aortic semilunar and pulmonary semilunar valves all open?

         a.      ventricular filling phase

         b.      isovolumetric ventricular relaxation phase

         c.      ventricular ejection phase

         d.      these valves are never all open at the same time

 

2.      The tricuspid valve:

         a.      lies between the left atrium and left ventricle

         b.      closes when the second heart sound is heard

         c.      is closed throughout ventricular systole

         d.      is opened by contraction of the papillary muscle

 

3.      Closing of the atrioventricular valves:

         a.      causes the second heart sound

         b.      occurs at the start of ventricular systole

         c.      occurs when atrial pressure is greater than ventricular pressure

         d.      results from contraction of the papillary muscle

 

4.      The atrioventricular valves open because:

         a.      the papillary muscles contract

         b.      the sympathetic nervous system fires

         c.      pressure in the atria is greater than pressure in the ventricles

         d.      pressure in the ventricles is greater than pressure in the atria

 

5.      Consider the following phases of the cardiac cycle:

         A.      ventricular filling

         B.      isovolumetric ventricular contraction

         C.      ventricular ejection

         D.      isovolumetric ventricular relaxation

         The aortic and pulmonary semilunar valves are open during which of the following phases?

         a.      A & B                  b.      B & C                  c.      C only                  d.      B, C, & D

 

6.      The aortic semilunar valves close:

         a.      throughout ventricular systole

         b.      cause the first heart sound

         c.      when aortic pressure is greater than ventricular pressure

         d.      when ventricular pressure is greater than atrial pressure

 

7.       In which of the following phases of the cardiac cycle is the atrial pressure greater than the pressure in the corresponding ventricle?

         a.      ventricular filling phase

         b.      isovolumetric ventricular contraction phase

         c.      ventricular ejection phase

         d.      isovolumetric ventricular relaxation phase

 

8.      Ejection of blood into the aorta will only occur under which of the following circumstances?

         a.      when ventricular pressure exceeds the aortic pressure

         b.      when ventricular pressure is increasing most rapidly

         c.      while the atrioventricular valve is open

         d.      throughout all of ventricular systole

 

9.      During the ventricular filling phase of the cardiac cycle:

         a.      the aortic and pulmonary valves are open

         b.      pressure in the left ventricle is greater than pressure in the left atrium

         c.      arterial blood pressure is falling

         d.      the electrocardiogram is between the QRS complex and the T wave

 

10.     Blood flows from the ventricle into the aorta because:

         a.      blood pressure in the atrium is greater than blood pressure in the ventricle

         b.      blood pressure in the ventricle is greater than blood pressure in the aorta

         c.      the atrioventricular valves close

         d.      aortic pressure is at its mean value

 

11.     During the ventricular filling phase of the cardiac cycle, which of these statements correctly describes the pressures in the various compartments?

         a.      aortic > ventricular > atrial

         b.      atrial > ventricular > aortic

         c.      aortic > atrial > ventricular

         d.      atrial > aortic > ventricular

 

12.     The blood pressure in the aorta is greater than that in the pulmonary artery because the:

         a.      blood flow through the systemic circulation is greater than the pulmonary circulation

         b.      resistance of the systemic circulation is greater than the pulmonary circulation

         c.      volume of blood within the systemic circulation is greater than the pulmonary circulation

         d.      blood entering the systemic circulation is oxygenated

 

13.     What percentage of the blood contained in the ventricles is ejected with each contraction?

         a.      100%

         b.      about 90%

         c.      about 60%

         d.      about 20%

 

Answers

 

1. d       2. c       3. b       4. c       5. c       6.

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c       7. a       8. a       9. c       10. b     11. c     12. b     13. c

 

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