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

12945 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

How does a plant respond to light?


What is the role of neurotransmitters at synpatic junctions?


State the 4 stages of mitosis (2 marks)


Trypsin is a protease produced in an inactive form in some cells of the pancreas. Suggest the advantage of producing it in an inactive form?


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