Describe and explain how the lungs are adapted to allow rapid exchange of oxygen between the air in the alveoli and blood in the capillaries around them. (5 marks)

The lungs have million of alveoli which increases the surface area, therefore increasing the rate of diffusion of oxygen into the lungs. The alveoli are very thin walled, which reduces the diffusion pathway of oxygen therefore slowing it to diffuse through quickly. The lungs are also well ventilated, which means fresh air with plenty of oxygen is continuously introduced into the alveoli - maintaining a diffusion gradient, which allows the oxygen to diffuse from the air into the alveoli quickly.

AZ
Answered by Aysha Z. Biology tutor

12878 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Explain how atherosclerosis can lead to damage of heart muscle.


What are the different roles of synapses in the nervous system?


Using Fick's Law, explain how rapid gaseous exchange takes place in a mammal


How does the pancreas control blood sugar levels?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning