Question

17 multiple choice 1 point which of the following is not one of the receptor superfamilies? second messenger - regulated receptors g protein - coupled receptors ligand - gated ion channels kinase - linked receptors 18 multiple choice 1 point the elimination half - life of a drug is defined as the amount of time it takes for the concentration of active drug in the ____ to ____ by half. plasma: decrease plasma: increase body: decrease body: increase 19 multiple choice 1 point which of the following routes of administration is considered an enteral route? inhalation ocular rectal nasal

Explanation:

Question 17

Receptor superfamilies include G protein - coupled receptors, ligand - gated ion channels, and kinase - linked receptors. Second messenger - regulated receptors are not a recognized receptor superfamily.

The elimination half - life of a drug is the time it takes for the concentration of the active drug in the plasma to decrease by half. Plasma is the relevant compartment for measuring drug concentration decay in this context, and the concentration should decrease, not increase. Measuring in the whole body is less specific for this pharmacokinetic parameter.

Enteral routes of administration involve the gastrointestinal tract. Rectal administration is considered an enteral route as it involves the rectum (part of the gastrointestinal tract). Inhalation is a pulmonary route, ocular is a topical route for the eye, and nasal is a topical route for the nose.

Answer:

Second messenger - regulated receptors

Question 18