The urinary system disposes of dissolved waste materials, the intestinal tract removes solid wastes, and the skin and lungs rid the body of heat energy. The immune system designed to protect against microscopic organisms and foreign substances that enter from outside the body and against some cancer cells that arise within. The nervous system works by electrochemical signals in the nerves and from one nerve to the next. The hormonal system exerts its influences by chemicals that circulate in the blood. These two systems also affect each other in coordinating body systems.
Faulty genes can cause body parts or systems to work poorly.
Some genetic diseases appear only when an individual has inherited a certain faulty gene from both parents. Choose a genetic disorder and search the Internet for current information and present your findings to the class.