Lungs and Gas Exchange

Question 1

what is gas exchange?

Answer 1

the heart pumps low oxygen/high carbon dioxide blood to the lungs

Question 2

trachea

Answer 2

• carries air to/from the lungs

- rings of cartilage to protect the airway

Question 3

bronchioles

Answer 3

• carries air to/from the alveoli

- split into multiple pathways to reach all the alveoli

Question 4

alveoli

Answer 4

• site of gas exchange in the lungs

- maximises surface area from efficient gas exchange

Question 5

capillaries

Answer 5

• allows gas exchange between into/out of blood

- oxygen diffuses into the blood and carbon dioxide diffuses out