A staff member asks a nurse to describe foam cells. The nurse's best response is that foam cells are
lipid-laden mast cells that have a soap-like texture.
macrophages that engulf low-density lipoproteins (LDLs).
injured neutrophil clots.
deposited adipose cells.
The Correct Answer is B
Choice A reason: Lipid-laden mast cells are not foam cells. Mast cells are immune cells that release histamine and other inflammatory mediators. They do not accumulate lipids or have a soap-like texture.
Choice B reason: Macrophages that engulf low-density lipoproteins (LDLs) are foam cells. They are part of the atherosclerotic process that leads to plaque formation in the blood vessels. They are called foam cells because they have a foamy appearance under the microscope.
Choice C reason: Injured neutrophil clots are not foam cells. Neutrophils are immune cells that fight infection and form pus. They do not engulf LDLs or contribute to atherosclerosis.
Choice D reason: Deposited adipose cells are not foam cells. Adipose cells are fat cells that store energy and secrete hormones. They do not phagocytose LDLs or form plaques in the blood vessels.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: Glucocorticoids can cause an increase in blood sugar by stimulating gluconeogenesis and inhibiting insulin action. Therefore, a patient with type 1 diabetes who is taking glucocorticoids will not have no change in blood sugar, but rather a rise in blood sugar.
Choice B reason: Glucocorticoids can cause an increase in blood pressure by promoting sodium and water retention and increasing vascular reactivity. Therefore, a patient with type 1 diabetes who is taking glucocorticoids will not have a decrease in the blood pressure, but rather a possible increase in the blood pressure.
Choice C reason: Glucocorticoids can cause an increase in blood sugar by stimulating gluconeogenesis and inhibiting insulin action. Therefore, a patient with type 1 diabetes who is taking glucocorticoids will have an increase in blood sugar. This is the correct statement that describes the expected effect of glucocorticoids in this patient.
Choice D reason: Glucocorticoids can cause an increase in blood sugar by stimulating gluconeogenesis and inhibiting insulin action. Therefore, a patient with type 1 diabetes who is taking glucocorticoids will not have an increase in the need for carbohydrates, but rather a need for more insulin to control the blood sugar.
Correct Answer is A
Explanation
Choice A reason: This is the correct mechanism of action of propranolol. Propranolol is a beta blocker medication, which means that it blocks the beta receptors in the heart and blood vessels. This reduces the sympathetic stimulation in cardiac muscle, which lowers the heart rate, contractility, and oxygen demand. This also reduces the renin release from the kidneys, which lowers the blood pressure.
Choice B reason: This is not the mechanism of action of propranolol. Propranolol does not increase the diuretic response in the renal tubules. This is the effect of diuretic medications, such as furosemide or hydrochlorothiazide, which increase the urine output and decrease the blood volume and pressure.
Choice C reason: This is not the mechanism of action of propranolol. Propranolol does not inhibit the conversion of angiotensin I to angiotensin II. This is the effect of angiotensin-converting enzyme (ACE) inhibitors, such as lisinopril or enalapril, which block the formation of angiotensin II, a potent vasoconstrictor that raises the blood pressure.
Choice D reason: This is not the mechanism of action of propranolol. Propranolol does not block alpha receptors throughout the body. This is the effect of alpha blockers, such as doxazosin or prazosin, which block the alpha receptors in the blood vessels and cause vasodilation, which lowers the blood pressure.
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