10 Questions
What is the primary site of gaseous exchange in humans?
Alveoli
What is the main function of the alveoli in the mammalian gaseous exchange system?
To exchange oxygen and carbon dioxide
What is the characteristic of the walls of the alveoli?
Thin and one cell thick
Why is the blood supply to the alveoli important?
To maintain a steep concentration gradient
How many alveoli are present in each lung?
300 million
What happens to the oxygen concentration in the alveoli during inspiration?
It increases
In which direction does oxygen diffuse across the alveolar and capillary wall?
From alveoli to blood
What is the direction of carbon dioxide diffusion?
From blood to alveoli
What is the driving force behind the diffusion of oxygen and carbon dioxide?
Passive diffusion
What is the result of the steep concentration gradient maintained by the blood movement in the alveoli?
Faster diffusion of gases
Test your knowledge on how mammals are adapted for gas exchange, including the structure and function of alveoli and its role in maximizing oxygen absorption. Prepare for your CAIE Biology A-level exam with these flashcards!
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
