(a(i))[2]
State two functions of hydrochloric acid in the stomach.
(a(ii))[2]
Describe what pepsin does.
(b)[2]
Define what is meant by assimilation.
(c)[2]
Stem cells are present in the epithelial tissue that makes up the stomach lining. Explain why these stem cells are needed.
(d)[2]
The epithelial cells in the small intestine have many microvilli. State what the microvilli do.
(e)[3]
Calculate the percentage increase in the average number of bacteria attached to epithelial cells from 45 minutes to 75 minutes. Give your answer to the nearest whole number.