The document discusses the major body systems and how they work. It explains that during exercise, blood flows faster and we breathe more air. The nervous system controls the body using the brain, spinal cord and nerves. The five senses give information to the brain. The locomotor system is made up of bones, joints and muscles and helps us move. The circulatory system includes the heart, blood and blood vessels to transport nutrients. The respiratory system uses the lungs, windpipe and nostrils to breathe in oxygen and out carbon dioxide. The reproductive system allows humans to have babies using eggs, ovaries, testicles and sperm. In summary, the document outlines how the senses, nervous, circulatory, respiratory, locomotor and reproductive systems all