Final answer:
Prostaglandins in the treatment of open-angle glaucoma regulate blood vessel constriction and relaxation, stimulate uterine contraction, and lower blood pressure. They reduce intraocular pressure by increasing the outflow of aqueous humor from the eye.
Step-by-step explanation:
The main mechanism of action of prostaglandins in the treatment of open-angle glaucoma is by regulating the constriction and dilation of blood vessels and relaxing smooth muscle cells in blood vessels. Prostaglandins, synthesized from arachidonic acid, induce labor by stimulating uterine contraction and lower blood pressure. They can reduce intraocular pressure by increasing the outflow of aqueous humor from the eye.