Which hormone helps to regulate the female menstrual cycle?

What is the primary role of chorionic villi?

What is the function of the ductus venosus in fetal circulation?

What are the initial diploid cells involved in spermatogenesis called?

Which hormone assists in the synthesis of vitamin D?

What effect does progesterone have on the uterus during the luteal phase?

What is the primary function of the umbilical cord?

Which hormone is dominant during the secretory phase of the uterine cycle?

Which part of the sperm contains the genetic material?

Which phase of mitosis involves the condensation of chromatin into chromosomes?