Which of the following statements about prostaglandins is not true?

Prostaglandins are a group of lipid compounds that perform various roles in the body, particularly in the regulation of various physiological functions. One important aspect of prostaglandins is their role in the inflammatory response. They promote inflammation, which is a crucial process for healing and fighting off infections.

Regarding their effects on blood vessels, prostaglandins can have varying impacts; they can both constrict and dilate blood vessels depending on the specific type of prostaglandin and the context in which they are acting. This means that the notion that they can only constrict blood vessels is inaccurate. Additionally, prostaglandins are produced in several tissues throughout the body, including the renal medulla, and they are commonly involved in the sensation of pain and the regulation of fever. This multifaceted nature of prostaglandins highlights their significance in many physiological processes, including inflammation, pain modulation, and vascular tone regulation.

Thus, stating that prostaglandins can only constrict blood vessels does not capture their diverse functions and is incorrect.