Does air go to alveoli first then bronchi?

Air does not go to the alveoli first and then the bronchi. The respiratory system is a complex network of organs and tissues that work together to bring oxygen into the body and expel carbon dioxide. Here's the general pathway that air takes as it enters the respiratory system:

1. Nose or Mouth: Air enters the body through either the nose or the mouth.

2. Pharynx: The air then travels down the pharynx, which is the back of the throat.

3. Larynx: The air passes through the larynx, also known as the voice box.

4. Trachea: From the larynx, the air enters the trachea, which is the windpipe.

5. Bronchi: The trachea branches into two primary bronchi, one leading to each lung.

6. Bronchioles: Each primary bronchus further divides into smaller branches called bronchioles, which carry air deep into the lungs.

7. Alveoli: The bronchioles end in tiny sacs called alveoli. The alveoli are where gas exchange occurs, with oxygen from the air passing into the bloodstream and carbon dioxide moving from the bloodstream into the alveoli.

8. Bronchioles, Bronchi, and Trachea: After gas exchange, the air travels back through the bronchioles, bronchi, and trachea.

9. Larynx, Pharynx, and Nose or Mouth: The air exits the body through the larynx, pharynx, and either the nose or the mouth.

So, the correct sequence of air movement is: nose/mouth -> pharynx -> larynx -> trachea -> bronchi -> bronchioles -> alveoli (gas exchange) -> bronchioles -> bronchi -> trachea -> larynx -> pharynx -> nose/mouth.