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IGCSE GCSE 0610 Biology Human Breathing System Lung

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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.

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A. STRUCTURE

Larynx
Alveoli (air sacs)

Intercostal muscle Trachea (windpipe)
(internal)

Bronchus
Cartilage rings

Lung
Bronchiole

Intercostal muscle
Rib
(external)

Diaphragm

• 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)

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Institution: GCSE
Study: GCSE
Module: Biology 0610
School year: 1

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Uploaded on: March 26, 2024
Number of pages: 7
Written in: 2023/2024
Type: Lecture notes
Professor(s): Md
Contains: All classes

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IGCSE GCSE 0610 Biology Human Breathing System Lung

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