penis the penis contains the urethra, which carries urine from the bladder and releases sperm during reproduction

testicle the male gonad or reproductive gland, either of two oval glands located in the scrotum (testes)

scrotum the musculocutaneous sac that encloses the testes and is formed of skin

sperm duct (tubes) a pair of these ducts in the male body, with one duct carrying sperm from each testis to the left and right ejaculatory ducts (tubes)

prostate gland an organ that surrounds the urethra of males at the base of the bladder, comprising a muscular portion, which controls the release of urine

ovary either of the two female reproductive organs, which produce ovum cells and secrete estrogen hormones

ovum the female reproductive cell or gamete, which is capable of developing, usually only after fertilization, into a new individual

fallopian tube either of a pair of long, slender tubes found in female that carry egg cells from the ovaries to the uterus

uterus the enlarged, muscular, expandable portion of the oviduct in which the fertilized ovum implants and develops or rests during prenatal development

period a period is when a woman’s body releases tissue it no longer needs. This tissue comes from the uterus, which is where a baby (fetus) can develop