For the next 9 questions, use the numbers 1, 2, or 3 to label the description as taking place in either the first, second, or third trimester of fetal development (respectively). 15. Heart begins to beat. 20. Fetus turns upside down (head 16. Embryo is considered a fetus. down). 17. Lungs are fully developed. 21. Fetus has more regular sleep cycles. 18. Fetus breathes amniotic fluid to help 22. Sex organs can show gender of fetus. develop lungs. Fine body hair a waxy substance help 23. 19. Bones harden. protect the fetus's skin. 24. How are the following terms related: placenta, umbilical cord, amniotic sac

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Reproductive system infection

The biological process through which parents produce new children is called reproduction. A reproductive system is a group of internal and external organs that collaborate to allow males and females to reproduce. Many experts believe that the reproductive system is one of the most important systems in the body due to its crucial function in the survival of the species. Among the body's basic systems, the reproductive tract is the one that differs the most between sexes, and it is also the only one that does not operate until puberty.