how it works
The Respiratory system functions to move oxygen from the outside environment into the body, it also removes carbon dioxide and water from the body.
Respiration is the process in which oxygen and glucose undergo a complex series of chemical reactions inside cells. These chemical reactions release the energy that fuels growth and other cell processes. Besides releasing energy, respiration produces carbon dioxide and water. Your body eliminates the carbon dioxide and some of the water through your lungs. To a scientist, breathing and respiration mean different things. Respiration, which is also called cellular respiration, refers to the chemical reactions inside cells. Breathing refers to the movement of air into and out of the lungs.
Your respiratory system gets oxygen into your lungs. However, respiration could not take place without your circulatory and digestive systems. The digestive system absorbs glucose from food. The circulatory system carries both oxygen from your lungs and glucose from food to your cells.
Cilia The cilia that line the nasal passages help remove trapped particles. The brown particles in the photograph are dust; the orange particles are pollen grains. When a person sneezes, many of the trapped particles are shot out into the air.
The Trachea From the pharynx, air moves into the trachea (tray kee uh), or windpipe. You can feel your trachea if you gently run your fingers down the center of your neck. The trachea feels like a tube with a series of ridges. The firm ridges are rings of cartilage that strengthen the trachea and keep it open.