NEET Biology question
Consider the following statements about the human heart and circulation. I. The SA node (pacemaker) is located in the upper right corner of the right atrium. II. The pulmonary artery carries oxygenated blood from the heart to the lungs. III. The atrioventricular (AV) valves close during ventricular diastole. IV. The average cardiac output of a healthy resting adult is about 5 litres per minute. Choose the correct option.
Solution
The SA node does lie in the upper right corner of the right atrium (I true), and the average cardiac output of a resting adult is indeed about 5 L/min, being the product of stroke volume (~70 mL) and heart rate (~72/min) (IV true); however, the pulmonary artery actually carries
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