Respiration

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Primary site of gaseous exchange in human lungs is:

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1. **Structure of Respiratory System**: Air travels through the trachea, bronchi, and bronchioles to reach the deep lung tissue.
2. **The Alveoli**: These are tiny, thin-walled, balloon-like air sacs at the end of the respiratory tree.
3. **Function**: The **alveoli** are the primary sites for the exchange of gases ($O_2$ and $CO_2$) between the inhaled air and the blood in the surrounding pulmonary capillaries.
4. **Mechanism**: Gaseous exchange occurs across the alveolar-capillary membrane purely by **diffusion**.

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Respiration

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