Respiratory System Notes

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Presentation transcript:

Respiratory System Notes

Primary function: To obtain oxygen for use by body's cells & eliminate carbon dioxide that cells produce

Factoids... that may be worth millions on Jeopardy Your lungs contain almost 1500 miles of airways. Every minute you breathe in 13 pints of air. People tend to get more colds in the winter because we're indoors more often and in close proximity to other people. When people sneeze, cough and even breathe -- germs go flying!

Why do you need to breathe? All the cells in your body require oxygen. Without it, they couldn't move, build, reproduce, and turn food into energy. In fact, without oxygen, they and you would die!

Cellular Respiration The equation for the complete breakdown of glucose by aerobic eukaryotes  is:   C6H12O6  +  6O2   6CO2  +  6H2O  +  36 ATP (ATP = energy for the cells)

How do you breathe? Your diaphragm and other muscles literally change the space and pressure inside your body to accommodate breathing. When your diaphragm pulls down, it not only leaves more space for the lungs to expand but also lowers the internal air pressure. Outside, where the air pressure is greater, you suck in air in an inhale. The air then expands your lungs like a pair of balloons. When your diaphragm relaxes, the cavity inside your body gets smaller again. Your muscles squeeze your rib cage and your lungs begin to collapse as the air is pushed up and out your body in an exhale.

How does this exchange work? With the help of the red blood cells in your bloodstream. Your red blood cells are like box cars on train tracks. They show up at the sacs (alveoli) at just the right time, ready to trade in old carbon dioxide that your body's cells have made for some new oxygen you've just breathed in. Diffusion helps all this happen.

What happens to the carbon dioxide? It goes through the lungs, back up your windpipe and out with every exhale. Plants use it during photosynthesis…continuing the cycle.