(a) Write the function of the following in the human alimentary canal:

1. Saliva
2. HCI in the stomach
3. Bile juice
4. Villi

(b) Write one function for each of the following enzymes:

1. Pepsin
2. Lipase

(a) Functions in the human alimentary canal:

1. Saliva – Contains amylase which breaks down starch into sugar.
2. HCl in the stomach – Creates an acidic medium for activation of pepsin and kills germs.
3. Bile juice – Emulsifies fats and neutralizes acidic chyme from stomach.
4. Villi – Increase surface area for absorption of digested nutrients in small intestine.

(b) Enzyme functions:

1. Pepsin – Digests proteins into peptones.
2. Lipase – Breaks down fats into fatty acids and glycerol.