Organisms Exchange Substances With Their Environment

Question 1

Explain why ventilation of the lungs increases the efficiency of gas exchange

Answer 1

Brings more oxygen into the lungs/removes carbon dioxide
Maintains concentration gradients
Between alveoli and blood/capillaries

Answer 2

Lipid/fatty acid part of membrane is non-polar/hydrophobic;
Oxygen and carbon dioxide small/ non-polar (molecules);
Oxygen/carbon dioxide can diffuse through/dissolve in/
get between molecules in this layer;
Down a concentration gradient;