Coronary Circulation and Blood Flow Regulation Quiz

What is the primary focus of this lesson?

• Basic cardiac anatomy

• Anatomy of the coronary circulation

• Regulation of blood flow to the heart

• Heart diseases and treatments

What percentage of cardiac output is typically directed to the heart at rest?

• 10%

• 5%

• 15%

• 20%

During exercise, how much can the blood flow to the heart increase?

• 500 to 1000 ml per minute

• 2000 to 3000 ml per minute

• 1000 to 2000 ml per minute

• 3000 to 4000 ml per minute

What is the term used to describe the increase in blood flow to match increased oxygen demand?

• Passive hyperemia

• Active hyperemia

• Static hyperemia

• Reactive hyperemia

Which system's activation leads to increased cardiac output and myocardial oxygen demand?

• Central nervous

• Sympathetic

• Parasympathetic

• Peripheral nervous

What role does adenosine play in coronary blood flow regulation?

• It has no effect

• It causes vasodilation

• It causes vasoconstriction

• It increases heart rate

How does nitric oxide contribute to vasodilation?

• By decreasing cyclic AMP

• By decreasing cyclic GMP

• By increasing cyclic AMP

• By increasing cyclic GMP

What is the effect of endothelium on coronary vessels?

• It causes vasodilation

• It causes vasoconstriction

• It has no effect

• It increases blood pressure

Which of the following is NOT a vasoactive mediator discussed in the lesson?

• Oxygen

• Adenosine

• Calcium

• CO2

What is the primary method to increase oxygen delivery to the heart?

• Increasing heart rate

• Decreasing heart rate

• Increasing blood flow

• Decreasing blood flow