Exercise and Coronary Blood Flow

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During strenuous exercise, the work output of the heart increases by approximately how much?

6-7 times

8-9 times (correct)

2-3 times

4-5 times

What percentage of coronary blood flow is used by the heart during strenuous exercise?

70-80% (correct)

10-20%

30-40%

50-60%

How does sympathetic stimulation indirectly affect the work output of the heart during exercise?

It varies depending on the individual

It decreases the work output

It has no effect on the work output

It increases the work output (correct)

What is the primary role of sympathetic innervation in the heart?

It is unclear Signup and view all the answers

What effect does noradrenaline have on skeletal muscle arterioles?

Vasoconstriction Signup and view all the answers

What effect does adrenaline have on skeletal muscle arterioles?

Vasodilation Signup and view all the answers

Which type of receptor dominates in causing vasodilation of skeletal muscle arterioles?

β2 receptors Signup and view all the answers

What is the primary factor that increases oxygen demand during exercise?

Increased metabolic demand Signup and view all the answers

How does the closing of arterioles during systole affect the diastolic filling period during exercise?

It decreases the diastolic filling period Signup and view all the answers

Which of the following is the primary controller of coronary blood flow?

Local metabolism Signup and view all the answers

Which artery supplies blood to the walls of the left atrium and left ventricle?

Left coronary artery Signup and view all the answers

Which of the following is NOT a learning outcome for the lecture on exercise and coronary blood flow?

Understand the control of coronary blood flow Signup and view all the answers

Which part of the interventricular septum does the right coronary artery supply?

Proximal portion of AV bundle of His Signup and view all the answers

Which vein drains into the right atrium via the coronary sinus?

Great cardiac vein Signup and view all the answers

Which of the following is NOT a physiological property of the heart?

Vasculature Signup and view all the answers

What is the main topic of the lecture on cardiovascular physiology?

Circulation of blood Signup and view all the answers

Which of the following is NOT a control mechanism for blood pressure?

Respiratory rate Signup and view all the answers

Which textbook provides information on coronary blood flow?

Both Guyton and Rang and Dale’s Pharmacology Signup and view all the answers