Final answer:
Oxytocin is responsible for stimulating uterine contractions during labor. Pitocin is a synthetic form of oxytocin that is used to induce or enhance labor. Oxytocin dosage is typically administered during labor, not postpartum.
Step-by-step explanation:
Oxytocin is primarily responsible for stimulating uterine contractions during labor. It is released by the posterior pituitary gland and plays a crucial role in the initiation and maintenance of labor. Synthetic oxytocin, known as Pitocin, is administered intravenously to induce or enhance labor when necessary. It is important to note that the dosage of oxytocin is typically administered during labor and not postpartum.