Question

Answer the following questions in detail

1. Differentiate between inhalation and exhalation.

2. How does the air that we breathe in reach the lungs ?

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Answer 1

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Answer 2

1. During inhalation, the lungs expand with air and oxygen diffuses across the lung's surface, entering the bloodstream. During exhalation, the lungs expel air and lung volume decreases. During exhalation, the diaphragm is relaxed which decreases the volume of the lung cavity.

Inhaled air has the same composition as normal air, it contains: 78% nitrogen 21% oxygen 1% inert gas such as argon 0.04% carbon dioxide little water vapour Exhaled air contains less oxygen and more carbon dioxide, it is also saturated with water vapour