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Biology
Respiratory system
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Molly Hunt
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Lungs
Organ that gets
oxygen
into your bloodstream and removes
carbon dioxide
from your
blood
The Lungs
Located in the
thorax
Separated from the lower body by the
diaphragm
Protected by the
ribcage
Surrounded by
pleural
membranes
Air flow through the lungs
1. Breathe in through
trachea
2. Trachea splits into
bronchi
3. Bronchi split into
bronchioles
4. Bronchioles end at
alveoli
Alveoli
Small
air sacs
in the lungs where
gas exchange
takes place
Gas exchange in the alveoli
1. Oxygen diffuses from alveoli into blood
2. Carbon dioxide diffuses from blood into alveoli
Oxygen and carbon dioxide transport
1. Oxygen released from red blood cells into body cells
2. Carbon dioxide diffuses from body cells into blood
Breathing rate
Number of
breaths
per
minute
Calculating breathing rate
Kerry takes 91 breaths in 7 minutes, her breathing rate is 13 breaths per minute
Alveoli are well adapted for carrying out gas exchange