Cardiac Cycle and Cardiac Conduction

During ventricular systole of the cardiac cycle, the period of time immediately after the start of ventricular contraction when the atrioventricular valves close (when ventricular pressure exceeds atrial pressure) until just before the opening of the semilunar valves is referred to as the __________     __________ period.

•   isovolumetric contraction

•  isovolumetric relaxation

During ventricular diastole of the cardiac cycle, the period of time immediately after the closure of the semilunar valves until just before the opening of the atrioventricular valves is referred to as the __________     __________ period.​

• isovolumetric

  Contraction

• isovolumetric relaxation

During the isovolumic contraction (also referred to as isovolumetric contraction) phase of the cardiac cycle:

• The atrioventricular valves and semilunar valves are closed.

   

• The atrioventricular valves and semilunar valves are open

• The atrioventricular valves closed and semilunar valves are open

• The atrioventricular valves open and semilunar valves are closed

During the isovolumic relaxation (also referred to isovolumetric relaxation) phase of the cardiac cycle:

• The atrioventricular valves and semilunar valves are closed.

• The atrioventricular valves and semilunar valves are open.

• The atrioventricular valves closed and semilunar valves are open

• The atrioventricular valves closed and semilunar valves are open

The cardiac events that occur from the beginning of one heart beat to the beginning of the next heart beat are called the cardiac cycle. During the cardiac cycle:

• The atria contract before the ventricles.

• The atria and the ventricles contract simultaneously.

• The ventricles contract before the atria.

The cardiac events that occur from the beginning of one heart beat to the beginning of the next heart beat are called the cardiac cycle. Which of the following is/are true?

• The left atrium and right atrium contract nearly simultaneously.

• The left ventricle and right ventricle contract nearly simultaneously.  

• The atria contract before the ventricles.

• The ventricles contract before the atria.

Tags

NGSS.HS-LS1-3

 During the cardiac cycle, the contraction phase is referred to as __________.

• Systole

• diastole

Diastole refers to what action?

• Filling

• Pumping

Systole refers to what action?

• Filing

• Pumping

What causes the AV Valve to close?

• High ventricular pressure

• Low ventricular pressure

• High atrium pressure