This revision notes provide detailed explanations, clear and concise pictures and concepts to help users understand the topic of IGCSE GCSE 0610 Biology human breathing system lung and aveoli.
• The trachea is lined with cartilage rings. These:
- support and protect the trachea
- allow the trachea to flex for breathing
• There are two sets of muscles that move the ribcage:
- internal intercostal muscles
- external intercostal muscles
Air moves from high low pressure
, B. HOW WE BREATHE IN AND OUT
Inhaling
External
intercostal
muscles
contract
VOLUME IN CHEST (THORAX) INCREASES
Ribcage
PRESSURE IN CHEST (THORAX) DECREASES
moves
up and out
AIR MOVES FROM HIGH LOW PRESSURE
AIR ENTERS THE CHEST
Diaphragm
contracts
(moves down)
Exhaling
Internal
intercostal
muscles Ribcage
contract moves
down and in
VOLUME IN CHEST (THORAX) DECREASES
PRESSURE IN CHEST (THORAX) INCREASES
AIR MOVES FROM HIGH LOW PRESSURE
AIR LEAVES THE CHEST
Diaphragm
relaxes
(moves up)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller MC28. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £4.47. You're not tied to anything after your purchase.
