Unit 5 · Animal Form and Function
The parts of the human respiratory system, how the airways clean and protect themselves, the structure of the alveoli, and how breathing in and out works by negative pressure.
Deshapriya Senevirathne. B.Sc. (Hons) Biology Special, University of Peradeniya — graduated with a class pass. All the content and lessons in A/L Biology on Paadama are reviewed by Deshapriya Senevirathne, and the lessons are taught by him.