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 B
Explanation
Choice A reason: Hyperthyroidism involves elevated T3 and T4 with low TSH due to excessive thyroid hormone production. The patient’s low T3/T4 and high TSH indicate reduced thyroid activity, not overactivity, as the pituitary increases TSH to stimulate the underactive thyroid, making this choice incorrect.
Choice B reason: Hypothyroidism is characterized by low T3 and T4 levels due to underactive thyroid function, prompting the pituitary to secrete more TSH to stimulate hormone production. This matches the patient’s lab results (low T3/T4, high TSH), often seen in primary hypothyroidism, making this the correct choice.
Choice C reason: Thyroid cancer may alter thyroid function but typically doesn’t present with consistently low T3/T4 and high TSH. It’s more likely to cause nodules or abnormal growths, not this specific hormonal pattern, which aligns with hypothyroidism, making this choice less likely.
Choice D reason: Pituitary adenoma causing secondary hypothyroidism would lower TSH, T3, and T4 due to impaired pituitary function. High TSH with low T3/T4 suggests primary thyroid failure, not pituitary dysfunction, making this choice incorrect for the patient’s hormonal profile.
Correct Answer is C
Explanation
Choice A reason: Normal BP is below 120/80 mm Hg. These readings, with diastolic consistently above 90 mm Hg, indicate hypertension, not normal BP, so this is incorrect.
Choice B reason: Isolated systolic hypertension involves systolic BP ≥130 mm Hg with diastolic <80 mm Hg. High diastolic readings rule this out, so this is incorrect for the pattern.
Choice C reason: BP readings above 130/80 mm Hg, especially with diastolic ≥90 mm Hg, classify as hypertension (Stage 2). This matches the patient’s pattern, making it the correct category.
Choice D reason: Prehypertension is 120–129/<80 mm Hg. These readings exceed this with high diastolic values, indicating hypertension, so this is incorrect for the BP pattern.
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