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Biology Chapter 23-4 - 1 Chapter 23 Section 4 The...

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Chapter 23 Section 4 – The Respiratory System Breathing – you do it all the time.   You’re doing it right now. You hardly ever think about it, though, unless you suddenly can’t breathe. Then, it becomes very clear that you have to breathe in order to live. Your body needs oxygen in order to get energy from the foods you eat. There is a difference between breathing and respiration. respiration – the exchange of oxygen and carbon dioxide between living cells and their environment, including breathing and cellular respiration. breathing is the first part of respiration; it is inhaling and exhaling air. respiratory system – collection of organs whose primary function is to take in oxygen and expel carbon dioxide. parts include the nose, throat, lungs, and passageways that lead to the lungs. Nose the main passageway into and out of the respiratory system.
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