Resparation and gas
exchange and brething
Ghina haniy
Respiration
Respiration is a chemical reaction which occurs in all living cells, releasing •
energy from glucose.
1-Air moves in and out of lungs
2-gas exchange between blood and air at alveoli .
3-co2(carbon dioxide)in blood difuess into air .
4-o2(oxygen)in air diffuess into blood.
breathing
1-The intercostal muscles between the
ribs contract (get shorter)this pulls the
ribs upwards and outwards.
2-Air moves down through the trachea
into the lungs to fill an extra air
Gas exchange
Why we need oxygen
All living things need •
oxygen to survive
Our bodies use it to
turn the fuel from our
food into energy
trachea
Nasal cavity
pharynx
larynx
trachea
bronchi
alveoli