GCSE Biology - Gas Exchange and Lungs #26

The video explains the structure and function of the lungs, focusing on how alveoli facilitate gas exchange. It describes the pathway of air from the mouth or nose to the alveoli, highlighting the role of trachea, bronchi, and bronchioles. The alveoli's thin walls and large surface area enhance diffusion of oxygen and carbon dioxide. The video also covers the continuous nature of breathing and blood flow, and provides a method to calculate breathing rate during exercise.

What is the primary function of the lungs in the human body?

Describe how the structure of alveoli facilitates gas exchange.

What role does hemoglobin play in the transport of oxygen and carbon dioxide?

Explain the process of how oxygen enters the bloodstream from the alveoli.

How does exercise affect breathing rate, and how can it be calculated?