Reproductive Systen
    Sea turtles like all other turtle species exhibit internal fertilization. Sperm, from the male's penis, leaves the male and enters the female. Fertilization of the egg actually occurs in the oviducts of the female (some species can store the sperm for years at a time before fertilization takes place). All species of turtles lay eggs on land. Sea turtles in particular, migrate long distances (in some cases thousands of miles) to lay their eggs and nest on the beaches where they were born. After the eggs are laid and covered, the female turtles abandons them never to see or raise her young. The sex of the baby sea turtles is determined by temperature and the sun heats the eggs until they hatch (Merchant et al. 1997).
 
 

Excretory System
    The excretory system of the turtle is responsible for removing harmful wastes from the turtle's body and blood. The kidney of the turtle performs the blood filtering process and the wastes are then sent to the bladder as urine. In sea turtles the kidneys are also aided by the salt gland to get rid of the excess salt in the sea water (Prange and Greenwald 1980).  The bladder is the storage place of the urine.  From the bladder the urine goes to the cloaca which is where urine leaves the body. The cloaca is also used to take in oxygen and other nutrients in sea turtles when they reach critical levels.