Oxytocin and cholecystokinin are transported through the bloodstream and arrive at the uterus at the same time. Oxytocin causes the uterus to contract, whereas cholecystokinin has no effect. Why?

Question

Quizplus · Accepted Answer

The correct answer is A because the uterus has receptors for oxytocin but not for cholecystokinin. Receptors are proteins found on the surface of cells that can recognize and bind to specific molecules, such as hormones like oxytocin. When oxytocin binds to its receptor on the surface of uterine cells, it triggers a series of events that lead to muscle contraction, which ultimately results in labor and delivery. Cholecystokinin, on the other hand, does not bind to any receptors on uterine cells, so it cannot cause any contractions or other effects.

Oxytocin and Cholecystokinin Are Transported Through the Bloodstream and Arrive