Chapter 6

Question 1

Describe how oxygen in the air reaches capillaries surrounding alveoli in the lungs (details of breathing not required)

Answer 1

1. Trachea and bronchi and bronchioles;
2. Down pressure gradient;
3. Down diffusion gradient;
4. Across alveolar epithelium;
5. Across capillary endothelium/epithelium;

Question 2

Describe how proteins are digested in the human gut

Answer 2

1. Hydrolysis of peptide bonds;
2. Endopeptidases break polypeptides into smaller peptide chains;
3. Exopeptidases remove terminal amino acids;
4. Dipeptidases hydrolyse/break down dipeptides into amino acids;