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Tristan bannon Skeleton system The skeleton is a framework in are body. It holds our organs and it protects them too. The muscles attach to our bones and it helps us move are body. The skull has more then 20 bones in it. Your bones are a hard type of tissue. Our bones are not all that hard the part that is soft is the marrow. The marrow helps protect us by fighting off infections, & other diseases,& helps produce red blood cell & helps the cells function. Digestive system The digestive system starts to function before you take a bite of food. When you smell the food your digestive system starts to work. When you take a bite of food you start to make it smaller then the digestive system pushes the food out and that is your poop the food you just ate. The saliva will moist it and it is easier to swallow the food then it starts to go in the digestive system and it will start to brake down. Respiratory system The lungs, throat, mouth and others are in the respiratory system. The respiratory system helps us breath. Respiratory problems are from smoking & from air pollution. Oxygen is taken in by the airways to the lungs transfer to the rest of the body in the blood. The lungs also give off carbon dioxide into the atmosphere. Humans & land animals have the same kind of respiratory system as we do. Circulatory systems The circulatory system is made of the heart, blood vessels,& veins. There are red blood help us get oxygen in are organs. The white blood cells helps us hell our scabs. Are cells are made of plasma. plasma is a liquid. The nervous system Humans have 100 billon nerves in there body. You may think of your brain as the central computer that controls your body, well the nervous system sends you messages to your brain. The nerves are all over your body and tell you what is going on.