The basic anatomical bits are the kidney, the ureters and the bladder. The delivery system at the end is the urethra, in the penis or the vulva.
Urine is actually surprisingly important. Check out the blood buffer systems, and definitions of Acidosis & Alkalosis.
Some of the important things you need to know, such as renin, and general workings of the groinal area will be in the endocrine section.
The penis is attached to the scrotum, which hangs underneath. It contains the testis, epididymis and spermatic cord.
The vas deferens runs from the scrotum, through the spermatic cord and along behind the bladder. It passes down, and is joined by the seminal vesicles, draining into the urethra at the prostate.
The ovaries are at one end of the female genital tract. They pass ova into the uterine tubes, which carry them down into the uterus.
Sperm pass through the uterus via the cervix, the tight end of the vagina. The entrance of the vagina is the vulva, where the clitoris can also be found, as well as the exit of the urethra.