A patient with left-sided heart failure is hospitalized with pulmonary edema. The nurse providing this patient's care would consider which physiology when explaining this disorder to the patient's family?
1. The normally high-pressure pulmonary circuit can damage lung tissue and cause pulmonary edema.
2. Since pulmonary veins have no valves, blood can back up into the lungs causing pulmonary edema.
3. The oxygen-rich blood that enters the pulmonary circuit tends to increase pressures in the tissue, causing pulmonary edema.
4. The arteries of the pulmonary circuit are single layer.
Answer: 2
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