You can find all my A Level Biology videos fully indexed at https://www.freesciencelessons.co.uk/...

In this video, we look at breathing in humans. This is also called ventilation. First we explore inhalation, looking at the muscles involved and how inhalation is an active process. We then explore exhalation. We also look at how the internal and external intercostal muscles are antagonistic.

This video is aimed at the UK A Level Biology specifications. Students studying International A Level Biology will need to check their specification.

Image credits:

Swimmer
https://commons.wikimedia.org/wiki/Fi...
Oleg Dubyna from Poltava, Ukraine, CC BY-SA 2.0 https://creativecommons.org/licenses/..., via Wikimedia Commons