What role do receptors play in pharmacodynamics?
Medications must bind with receptors to mimic or block the actions of the body's own regulatory molecules.
Activation of the receptor by the medication will cause the cell to develop a new function.
Receptors are necessary to start the process of metabolism of the medication by the liver.
Binding of a medication to a receptor will allow the medication to become more selective to that type of receptor.
The Correct Answer is A
In pharmacodynamics, receptors play a crucial role in mediating the effects of medications ¹. Medications must bind with receptors to mimic or block the actions of the body's own regulatory molecules ¹. This binding can activate or inhibit the receptor, leading to a biological response ¹.
Option B is incorrect because activation of the receptor by the medication does not necessarily cause the cell to develop a new function.
Option C is incorrect because receptors do not start the process of metabolism of the medication by the liver.
Option D is incorrect because binding a medication to a receptor does not necessarily make the medication more selective to that type of receptor.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
An agonist is a molecule that can bind to and activate a receptor to induce a biological response ³. Agonists can be endogenous molecules, such as hormones or neurotransmitters, or medications that mimic the action of endogenous agonists ³.
Option A is incorrect because an agonist does not prevent receptor activation by other medications.
Option C is incorrect because an agonist does not increase the affinity of a receptor for a different medication.
Option D is incorrect because an agonist does not both block and activate a receptor.
Correct Answer is B
Explanation
The therapeutic range for valproic acid is 50-100 mcg/mL ¹. In this case, the client has a serum range for valproic acid of 130 mcg/mL, which is above the therapeutic range but below the toxic level of >100 mcg/mL ¹. The nurse would anticipate that the provider will increase the daily dose of valproic acid to bring the serum range within the therapeutic range.
Option A is incorrect because the serum range is above the therapeutic range and changes may be needed.
Option C is incorrect because changing the medication may not be necessary if adjusting the dose can bring the serum range within the therapeutic range.
Option D is incorrect because decreasing the dose would lower the serum range further below the therapeutic range.
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