4. The uterus is a hollow muscular organ located at the lower abdomen of a female. What is its function? A. It is the site where fertilized egg is implanted. B. It expands to let the baby pass during normal delivery. C. It serves as the entrance of the egg cell to the fallopian tube. D. It expands during childbirth to allow the passage of the baby. 5. The prostate gland is a thumb-sized organ in the male reproductive system consisting of muscular and glandular tissues that lie around the base of the bladder. What is its function? A. It produces testosterone. B. It transports mature sperm to the urethra. C. It transports urine and semen out of the body. D. It produces fluid that nourishes and protects the sperm.​