Final answer:
Physiological changes in a fetus can occur if a pregnant woman experiences intense stress that affects her emotional state.
Step-by-step explanation:
During pregnancy, physiological changes can occur in the fetus if the pregnant woman experiences intense stress that affects her emotional state, including fears and anxieties. These changes are primarily mediated by hormones secreted by the corpus luteum and placenta, such as estrogens, progesterone, and hCG. Estrogen maintains pregnancy, promotes fetal viability, and stimulates tissue growth in both the mother and developing fetus, while progesterone prevents new ovarian follicles from developing and suppresses uterine contractility.