Question Video: Identifying the Purpose of the Lungs | Nagwa Question Video: Identifying the Purpose of the Lungs | Nagwa

Question Video: Identifying the Purpose of the Lungs Biology • Second Year of Secondary School

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What is the primary purpose of the lungs in the gas exchange system?

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Video Transcript

What is the primary purpose of the lungs in the gas exchange system? (A) To pump oxygenated blood around the body. (B) To bind to oxygen from the atmosphere. (C) To break down excess glucose for energy. (D) To inhale and exhale air. (E) To exhale oxygen.

The cells in our body can get energy from breaking down glucose by using oxygen in a process called cellular respiration. This process creates the waste products carbon dioxide and water. Oxygen is inhaled in the air we breathe. This allows oxygen to enter the bloodstream so that it can be distributed to the cells in our body. The waste products carbon dioxide and water can then be transferred to the bloodstream and travel to the lungs to be excreted as we exhale. This represents the primary purpose of the lungs in the gas exchange system and is given by answer choice (D): to inhale and exhale air.

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