A person has ventricular septal defect-a hole in the wall (septum) that separates the two lower chambers (ventricles) of the heart.What kind of problems will this person encounter?I. More oxygen poor blood will be contained in the right atrium.II. Volume of the blood circulating through the lungs will be higher.III. Less oxygen will be delivered to the body tissues.
Correct answer: C. I and II
- A. I only
- B. III only
- C. I and II
- D. II and III
Explanation
A ventricular septal defect allows oxygen-rich blood to mix with oxygen-poor blood, leading to several issues. Option I is correct because the mixing of blood causes more oxygen-poor blood to be present in the right side of the heart. Option II is correct because the defect causes more blood to be pumped into the pulmonary circulation. The correct answer is I and II, as these are the primary effects of a ventricular septal defect.
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The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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