2.4 The small intestine

Question 1

what are the 2 sections of the small intestine

Answer 1

1. the duodenum
2. the illeum

Question 2

what do the walls of the duodenum contain

Answer 2

glands that secrete alkaline juice and mucus (BRUNNER’S GLANDS)

Question 3

what is the function of the alkaline juice produced by the duodenum

Answer 3

-keeps contents of the small intestine at correct pH for enzyme action.
-mucus = for lubrication

Question 4

where are enzymes secreted in the duodenum

Answer 4

by the tips of the villi

Question 5

what enzymes are produced by the duodenum

Answer 5

maltase
endopeptidases + exopeptidases

Question 6

what is the ileum adapted for

Answer 6

absorption

Question 7

how is the ileum adapted to have a large surface area

Answer 7

long with folded lining

Question 8

what are the finger like projections on the ileum

Answer 8

villi

Question 9

what are the microscopic projections on the villi called

Answer 9

microvilli

Question 10

what adaptations do the epithelial cells have in the small intestine

Answer 10

epithelial cells contain large numbers of mitochondria (ATP needed for active absorption)

Question 11

what is the method of absorption: fatty acids + glycerol

Answer 11

diffusion

Question 12

what is the method of absorption: vitamins

Answer 12

diffusion

Question 13

what is the method of absorption: glucose + amino acids

Answer 13

co transport (requires ATP)