Which of the following receptors is intracellular and modulates gene transcription?

A drug that binds to a receptor but does not activate it, and also prevents other ligands from binding, is known as:

Which second messenger is increased by β-adrenergic receptor stimulation?

Which of the following drugs acts by blocking voltage-gated sodium channels?

Which drug is a selective α1-adrenergic agonist used to raise blood pressure in hypotensive states?