Cardiac Cycle and Heart

Identify part numbers 3 and 5.

• 3: right atrium; 5: aorta

• 3: left atrium; 5: aorta

• 3: right atrium; 5: pulmonary artery

• 3: left atrium; 5: pulmonary artery

Identify part numbers 6 and 9.

• 6: aorta; 9: pulmonary arteries

• 6: aorta; 9: pulmonary veins

• 6: pulmonary artery; 9: pulmonary veins

• 6: vena cava; 9: pulmonary arteries

The left ventricle has a thicker muscular wall than the right ventricle in order to withstand the highest pressure generated.

• True

• False

The right ventricle pumps deoxygenated blood to the lungs for oxygenation.

• True

• False

There are four valves present in the human heart.

• True

• False

What is happening at point A?

• The bicuspid valve opens for blood to flow from left atrium to left ventricle

• The bicuspid valve opens for blood to flow from left ventricle to aorta

• The bicuspid valve closes to prevent backflow of blood from left atrium to left ventricle

• The bicuspid valve closes to prevent backflow of blood from left ventricle to left atrium

What is happening at point B?

• Bicuspid valve is forced open

• Bicuspid valve remains closed

• Semi-lunar valve is forced open

• Semi-lunar valve remains closed

When does ventricular systole occur?

• From points A to B

• From points A to C

• From points B to C

• From points B to D

What causes the changes in pressure in the ventricles?

• Opening and closing of atrioventricular valves

• Opening and closing of semi-lunar valves

• Contraction and relaxation of muscles in ventricles

• Contraction and relaxation of ventricles

One cardiac cycle is made up of

• one atrial systole + one ventricular diastole

• one atrial systole + one ventricular systole

• one ventricular systole + one ventricular diastole

• one ventricular systole + one atrial diastole