Final answer:
Prostaglandins activate G protein-coupled receptors which can then modulate various cellular functions such as inflammation, pain, and blood pressure regulation.
Step-by-step explanation:
Prostaglandins act on G protein-coupled receptors, which when activated can activate or inhibit different cellular functions. These receptors are involved in numerous physiological processes, including inflammation, pain sensation, and the regulation of blood pressure. Prostaglandins binding to their G protein-coupled receptors can lead to a cascade of signaling events within the cell, ultimately resulting in various responses depending on the type of cell and the specific receptor that is activated.