Human Biology 1. For the body to use food for energy and building materials, the food must first be digested into molecules that are absorbed and transported to cells. Read a variety of articles which address the relationship of human energy requirements to diet. List the daily activities of the class and their energy requirements which satisfy the energy required to support such activities. To burn food for the release of energy stored in it, oxygen must be supplies to cells, and carbon dioxide removed.
Lungs take in oxygen for the combustion of food and they eliminate the carbon dioxide produced.
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.