During pregnancy, which hormone promotes growth of blood vessels in the uterus?

• A. Promotes blood vessel growth in the uterus
• B. Stimulates milk production
• C. Regulates circadian rhythm
• D. Increases fetal movement

Answer: (A)

Estrogen drives the growth of blood vessels in the uterus during pregnancy. By promoting angiogenesis and expanding the uterine vasculature, it increases blood flow to support the developing fetus and placenta, ensuring a steady supply of oxygen and nutrients. The other options reflect different roles: one relates to milk production (prolactin), another to circadian rhythms (melatonin), and fetal movement isn’t governed by a single hormone in the way described.