[Campbell Biology P.1085] Based on Figure 46.18, which statement best describes a part of the... | Practice Question

Based on Figure 46.18, which statement best describes a part of the positive feedback loop during labor?

  • A: Estradiol directly stimulates the uterus to contract.
  • B: Oxytocin inhibits the production of prostaglandins.
  • C: Prostaglandins stimulate more contractions of the uterus, leading to increased oxytocin release.
  • D: The corpus luteum secretes oxytocin to initiate labor.
  • E: Decreased uterine contractions stimulate the release of oxytocin.

Explanation

Figure 46.18 illustrates a positive feedback loop. Prostaglandins stimulate more uterine contractions. These increased contractions, in turn, stimulate the release of more oxytocin as indicated by the 'Positive feedback' arrow from 'Stimulate more contractions of uterus' back to 'Oxytocin' , which further enhances contractions both directly and by stimulating prostaglandin production, thus reinforcing the loop.