Final answer:
In humans, labor (childbirth) is influenced by a positive feedback mechanism, where the hormone oxytocin leads to increased intensity of uterine contractions until the baby is born.
Step-by-step explanation:
In humans, the process that is influenced by a positive feedback mechanism is Labor (childbirth). A positive feedback loop is a biological process where the output of a system acts to enhance or amplify changes; this tends to move a system away from its equilibrium state and make it more unstable. This is seen in labor, where the release of the hormone oxytocin leads to uterine contractions, which in turn cause more oxytocin to be released, further intensifying the contractions. This cascade continues until the baby is born.
In contrast, negative feedback mechanisms work to maintain homeostasis by reversing changes to bring the system back to its set point. Examples of negative feedback include body temperature regulation, fluid retention, and blood sugar level maintenance.