Which sequence best describes the direction of blood flow through the heart and lungs?
Vena cava → Right atrium → Right ventricle → Lungs → Pulmonary artery → Left atrium → Left ventricle.
Right atrium → Right ventricle → Pulmonary vein → Lungs → Pulmonary artery → Left atrium → Left ventricle.
Right atrium → Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium → Left ventricle.
Right atrium → Right ventricle → Lungs → Pulmonary vein → Pulmonary artery → Left atrium → Left ventricle → Vena cava.
The Correct Answer is C
Choice A rationale
This sequence is incorrect because it suggests that blood goes from the lungs to the pulmonary artery, which is not accurate. The pulmonary artery carries deoxygenated blood from the heart to the lungs.
Choice B rationale
This sequence is incorrect because it suggests that blood goes from the pulmonary vein to the lungs, which is not accurate. The pulmonary vein carries oxygenated blood from the lungs to the heart.
Choice C rationale
This sequence correctly describes the direction of blood flow through the heart and lungs. Deoxygenated blood enters the right atrium, goes to the right ventricle, then is sent to the lungs via the pulmonary artery. After picking up oxygen in the lungs, the blood returns to the heart via the pulmonary vein, entering the left atrium, then the left ventricle, from where it is pumped out to the rest of the body.
Choice D rationale
This sequence is incorrect because it suggests that blood goes from the pulmonary vein to the pulmonary artery, which is not accurate. The pulmonary vein carries oxygenated blood from the lungs to the heart, and the pulmonary artery carries deoxygenated blood from the heart to the lungs.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Elevating the leg above the level of the heart would not be beneficial in this case. This action would actually reduce blood flow to the leg, which is already compromised due to the arterial occlusion.
Choice B rationale
Exercising the leg would increase the oxygen demand of the tissues in the leg, which could exacerbate the problem. The tissues in the leg are already deprived of oxygen due to the arterial occlusion.
Choice C rationale
Applying a compression stocking to the leg would not be beneficial in this case. This action would further compromise blood flow to the leg, which is already reduced due to the arterial occlusion.
Choice D rationale
Keeping the patient in bed in the supine position is the correct action. This position will decrease the oxygen demand of the tissues in the leg and minimize ischemic damage until circulation can be restored.
Correct Answer is D
Explanation
Choice A rationale
Serum hemoglobin of 14.7 g/dL is within the normal range for adults, which is typically 12.0 to
16.0 g/dL for women and 13.5 to 17.5 g/dL for men. Hemoglobin is a protein in red blood cells that carries oxygen throughout the body. While it’s important to monitor hemoglobin levels, a value of 14.7 g/dL does not raise immediate concerns related to hypertension.
Choice B rationale
A blood glucose level of 96 mg/dL is considered normal. The normal range for fasting blood glucose is between 70 and 100 mg/dL1. Blood glucose levels are important to monitor, especially in patients with diabetes, but a value of 96 mg/dL is not immediately concerning in the context of hypertension.
Choice C rationale
A serum potassium level of 4.5 mEq/L is within the normal range, which is typically 3.6 to 5.2 mEq/L1. Potassium is an essential electrolyte that helps regulate heart and muscle contractions and maintain fluid balance in the body. While it’s important to monitor potassium levels, a value of 4.5 mEq/L does not raise immediate concerns related to hypertension.
Choice D rationale
A serum creatinine level of 2.8 mg/dL is high. Creatinine is a waste product that’s produced by your muscles and filtered out of your blood by your kidneys. High levels of creatinine can indicate that the kidneys aren’t working properly, which can be a complication of hypertension. Therefore, this result is the most important to communicate to the healthcare provider.
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