Quiz on Cardiac Cycle and Heart Function

What is the duration of the human cardiac cycle?

• 0.5 sec

• 0.9 sec

• 1.2 sec

• 1.5 sec

During which phase do the inlet valves open?

• Ejection

• Diastole

• Isovolumetric contraction

• Systole

What is the End-Diastolic Volume (EDV) in an adult human?

• 140 ml

• 100 ml

• 80 ml

• 120 ml

What happens during the isovolumetric contraction phase?

• Inlet and outlet valves are open

• Inlet and outlet valves are closed

• Only inlet valves are closed

• Only outlet valves are closed

What is the duration of the ejection phase?

• 0.8 sec

• 0.5 sec

• 0.3 sec

• 0.15 sec

What type of murmur is associated with aortic stenosis?

• Pansystolic murmur

• Systolic murmur

• Decrescendo murmur

• Ejection murmur

According to Starling's Law, what happens when the ventricle is stretched?

• Stroke volume decreases

• Diastolic pressure decreases

• Systolic pressure generation increases

• Heart rate decreases

What is the effect of low blood volume on central venous pressure (CVP)?

• Increases CVP

• Reduces CVP

• Has no effect on CVP

• Increases stroke volume

What is the external pressure around the heart during filling?

• 10 to 15 cm H2O

• -5 to -10 cm H2O

• 0 to 5 cm H2O

• 5 to 10 cm H2O

What is the primary determinant of central venous pressure (CVP)?

• Blood pressure

• Cardiac output

• Heart rate

• Total volume of blood in circulation