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BIOLOGY 21 ON-LINE LAB 6: RESPIRATION & GAS EXCHANGE We breathe in order to take in oxygen (O2) and get rid of the waste products produced by our cells, namely carbon dioxide (CO2). The general term for this in animals is respiration. Taking in air is inspiration, while blowing air out is expiration. A respiratory cycle consists of one inspiration and one expiration. The rate at which your body performs a respiratory cycle depends on the levels of oxygen and carbon dioxide in your blood. Part 1: Gas Exchange ACTIVITY 1: DIFFUSION DEMONSTRATION Small molecules such as O2, and CO2 go back and forth across the cell membrane as a result of a process called diffusion. Diffusion is a simple concept that can be demonstrated by thinking about what happens when you spray yourself with perfume or scented deodorant. If you stand in the same place

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