Final answer:
During pregnancy, physiological changes are documented using ultrasounds, which safely show fetus development. It is true that fetuses produce urine. However, it is false that the umbilical artery carries oxygenated blood to the fetus, as it actually carries deoxygenated blood from the fetus to the placenta.
Step-by-step explanation:
During pregnancy, ultrasounds are commonly used as a safe imaging modality to document the physiological changes and development of the fetus. It is true that a fetus can produce urine, which is part of the amniotic fluid and plays a role in its development. Regarding the circulatory system, it is false that the umbilical artery carries oxygenated blood to the fetus; it actually carries deoxygenated blood and waste products from the fetus to the placenta. The correct imaging study that can be used most safely during pregnancy is c. ultrasounds, which are non-invasive and do not expose the fetus to ionizing radiation.
Pregnancy prompts a range of changes in the organ systems including weight gain from the growing fetus, amniotic fluid, enlarged uterus, additional breast tissue, and increased blood volume. Estrogen, progesterone, and hCG are essential hormones that maintain pregnancy, prevent new ovarian follicles from developing, suppress uterine contractility, and support fetal viability.