Cardiac Cycle(1)

If one cardiac cycle lasts 0.8 seconds, how many times will the heart beat between 10pm and 11.45pm

• 7875
• 131
• 4500
• 1650

How many audible sounds are produced during one heartbeat?

• 2
• 3
• 1
• 4

What cause the heart sounds? (1) closure of semilunar valves (2) closure of atrioventricular valves (3) closure of aorta (4) closure of vena cava (5) contraction of the ventricles

• 1,2,5
• 1 and 2 only
• 2 and 5 only
• 1, 2, 3, 4

During vigorous exercise, the heartbeats faster. Which part of the cycle will not be affected by the exercise?

• frequency of the heart sounds
• rate at which blood is pumped into the ventricles
• rate at which the ventricles pump out blood
• loudness of the heart sounds

During which of the following stage is the atrioventricular valve open?

• ventricular systole
• atrial systole
• ventricular diastole

Which of the following events occur duirng atrial systole?

• blood flows into the atria
• blood flows out of the atria
• blood is pumped out of the atria
• atrioventricular valves are slightly open

What causes pressure to rise in the ventricles during atrial diastole?

• contraction of the ventricles
• relaxation of the ventricles
• flow of blood into the ventricles from the atria
• contraction of the atrial walls

Ventricular diastole involves the following events except …………….

• Movement of blood into the atria
• movement of blood through the aorta and pulmonary arteries
• production of a heart sound
• movement of blood out of the ventricles into the atria

Closure of the semilunar valves results in (1) the first heart sound (2) the second heart sound (3) movement of blood from the left ventricles into the aorta (4) movement of blood from the aorta towards the pulmonary circulation

• 2 alone
• 2, 3 and 4
• 2 and 3 alone
• 1, 3 and 4

Peak ventricular pressure always occurs during ………………………..

• Ventricular systole
• Ventricular diastole
• Atrial systole
• Atrial diastole