WorksheetsCardiac Output Quiz
Total questions: 10
Worksheet time: 6mins
Under normal circumstances, how does the cardiac output (CO) from the right ventricle compare to that from the left ventricle?
It is the same as that from the left ventricle
It is twice as much as that from the left ventricle
It is half as much as that from the left ventricle
It is less than one-third of that from the left ventricle
Why is it important for the cardiac output from the left ventricle to equal that from the right ventricle?
To prevent oxygen from entering the blood
To maintain homeostasis and prevent pressure buildup in the circulation
To increase the heart rate
To decrease blood flow to the lungs
A 70-kg patient in the ICU has a cardiac output of 3.5 L/min. Which of the following best describes the clinical significance of a cardiac index of 0.5 L/min/m²?
It indicates a normal cardiac function for the patient’s body surface area
It suggests a high-output cardiac state requiring vasodilator therapy
It reflects severe cardiac dysfunction and inadequate tissue perfusion
It is expected in well-trained endurance athletes at rest
Which of the following factors increases End Diastolic Volume (EDV)?
Standing
Increased total blood volume
Increased intra-pericardial pressure
Increased heart rate
A 25-year-old athlete experiences a sudden drop in blood pressure upon standing. Which of the following best explains the immediate increase in heart rate observed in this scenario?
Decreased baroreceptor firing leading to increased sympathetic activity
Increased parasympathetic outflow to the sinoatrial node
Activation of baroreceptors leading to increased vagal tone
Decreased sympathetic tone to the ventricular myocardium
During severe hypoxia, a patient exhibits bradycardia despite increased sympathetic drive. Which of the following best explains this paradoxical response?
Direct inhibition of the SA node by low oxygen
Activation of pulmonary stretch receptors during apnea
Enhanced baroreceptor firing due to systemic vasodilation
Central chemoreceptor suppression of sympathetic tone
To which node does the left vagus nerve send impulses?
AV node
SA node
Bundle of His
Purkinje fibers
Depression affects heart rate by causing which of the following?
Increase in heart rate
Decrease in heart rate
No change in heart rate
Fluctuation in heart rate
What happens when chemoreceptors detect an increase in CO₂ or a decrease in pH?
They stimulate the cardiac centre, increasing heart rate and cardiac output
They decrease heart rate and cardiac output
They stimulate the respiratory centre to slow breathing
They cause vasoconstriction in the tissues
During a maximal treadmill test, a healthy 22-year-old athlete demonstrates a cardiac output of 25 L/min, compared to a resting value of 5 L/min. Which of the following mechanisms contributes least to this increase in cardiac output?
Increased sympathetic stimulation of the SA node
Enhanced venous return via skeletal muscle pump
Augmented myocardial contractility via β1-adrenergic activation
Increased vagal tone to the AV node
