What occurs when a drug binds to a receptor in the body?
It increases or decreases the activity of that receptor.
It alters the receptor to become non-responsive to its usual endogenous molecules.
It prevents the action of the receptor by altering its response to chemical mediators.
It gives the receptor a new function.
The Correct Answer is A
Choice A reason: Drug-receptor binding either activates (agonists) or inhibits (antagonists) receptor activity, altering physiological responses. This is the primary effect, making it the correct choice for receptor interaction.
Choice B reason: Drugs do not permanently alter receptors non-responsive; they modulate activity temporarily. Non-responsiveness may occur with chronic use, but it’s not the primary effect, so this is incorrect.
Choice C reason: Preventing receptor action is specific to antagonists, not all drugs. drugs bind to receptors. Binding broadly affects activity, so this is incorrect for the general effect of receptor binding.
Choice D reason: Drugs do not give receptors new functions; they enhance or block existing ones. ones. Activity modulation is the key effect, making this incorrect for what occurs during binding.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: Captopril PO is used for chronic hypertension, not acute crises, due to slower onset. IV nitroprusside acts rapidly to control severe hypertension, so this is incorrect.
Choice B reason: Hydralazine PO has a slower onset, unsuitable for hypertensive crisis requiring immediate control. IV nitroprusside is faster and titratable, making this incorrect for acute management.
Choice C reason: Minoxidil PO is for refractory hypertension, not emergencies, due to delayed action. Sodium nitroprusside IV is preferred for rapid control, so this is incorrect.
Choice D reason: Sodium nitroprusside IV is the drug of choice for hypertensive crisis, offering rapid, titratable blood pressure reduction. This aligns with urgent needs, making it the correct choice.
Correct Answer is C
Explanation
Choice A reason: A sodium level of 140 mEq/L is within the normal range (135-145 mEq/L). While furosemide can cause hyponatremia, this value is not concerning. Hypokalemia is a greater risk with furosemide and digoxin, as it potentiates digoxin toxicity, making this choice less critical than potassium.
Choice B reason: Oxygen saturation of 95% is normal (95-100%). Crackles suggest pulmonary edema, but this saturation doesn’t indicate severe hypoxia requiring immediate action. Hypokalemia poses a greater risk with digoxin and furosemide, as it increases toxicity potential, making this choice less concerning.
Choice C reason: A potassium level of 3.0 mEq/L (normal: 3.5-5.0 mEq/L) indicates hypokalemia, exacerbated by furosemide’s diuretic effect. In digoxin use, low potassium increases cardiac toxicity risk, causing arrhythmias, especially with an irregular heart rate noted, making this the most concerning value requiring immediate attention.
Choice D reason: A blood glucose level of 100 mg/dL is normal (70-110 mg/dL fasting). It’s unrelated to digoxin or furosemide’s primary risks (e.g., electrolyte imbalances, arrhythmias). Hypokalemia is a more immediate concern due to its synergistic toxicity with digoxin, making this choice less critical.
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