adaptations for gas exchange🔝

Question 1

alveoli

Answer 1

• very large surface area
• they are well supplied with blood vessels to take the absorbed oxygen away
• surface is one cell thick so the gases have a small distance to diffuse through
• surface is moist to dissolve oxygen so that it can diffuse through the membrane

Question 2

lung infections

Answer 2

the cells lining the tubes produce MUCUS which is sticky that traps dust and microbes from the air as is passes through

Question 3

cilia

Answer 3

hair like structures that moves back and forth pushing the mucus up to the top of the trachea so it can be swallowed and taken away from the body via the digestive system