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In the Human body, everything a human does has a system. All systems work together to help the body function. There are four mains systems within the human body; the Respiratory System, The Circulatory System, the Nervous System, and the Digestive System. The Respiratory System The anatomical features of the respiratory system include airways, lungs, and the respiratory muscles. Molecules of oxygen and carbon dioxide are constantly exchanged, through diffusion, between external environment and blood. This exchange process occurs in the alveolar region of the lungs. Air enters the nostrils, passes through the nasopharynx, the oral pharynx, through the glottis into the trachea, into the right and left bronchi, which branches into bronchioles, each of which terminates in a cluster of alveoli. In the alveoli does actual gas exchange take place. There are about 300 million alveoli in two adult lungs. The Circulatory System The circulatory system passes nutrients (like amino acids, electrolytes, and lymph), gases, hormones, blood cells, to and from cells in the body to help fight diseases and to help stabilize body temperature and pH to maintain homeostasis. This System does not only distribute blood, but also lymph (through the lymphatic system). The Circulatory System is so vast, but it reaches almost every point in the body; first blood leaves the heart from the left ventricle into the biggest artery, called the aorta. It is important that fresh blood from the aorta goes directly to the brain, because the brain needs oxygen constantly. Another important organ for the blood to pass through is the lung. Here waste carbon dioxide is replaced with fresh oxygen. Then blood returns to the heart through the veins. The Nervous System The Nervous system is a network of neurons that coordinate the actions of a human and send signals between different parts of the body. The nervous system consists of two parts; central and peripheral. The central nervous system of vertebrates contains the brain, spinal cord, and retina. The peripheral nervous system consists of clusters of ganglia (sensory neurons), and nerves connecting them to each other and to the central nervous system. With every touch, a nerve feels the touch and sends a message to the brain using electrochemical waves traveling along fibers called axons. The nerves can also communicate this way. The Digestive System The human digestive system is a complex chain of organs and glands that process food. In order to utilize the food humans eat, the body has to break food down into smaller molecules that it can process and has to excrete waste. The process starts in the mouth. Once the food is chewed so it can be swallowed, the esophagus forces the food into the stomach. Here the food is partly digested with stomach acids called chyme. Then it travels through the small intestine, big intestine, and then it is on its way out of the body. Example: The Respiratory system helps us breathe and gets fresh air to our lung which gives the air to our blood. Our blood brings this oxygen to the body helping it process nutrients that the Digestive system breaks down from food. We get food through our nervous system receiving messages that our body is hungry so we can eat to fuel our bodies. When these nutrients are broken down it is carried through the blood stream to all of the cells in our body so we can create energy to do things which keeps us alive.