The figure below represents a structure obtained from the ileum of a mammal. a) Give the identity of the structure. b) What is the importance of the structure named in (a) above? c) Name the parts lab

4. The figure below represents a structure obtained from the ileum of a mammal.

a) Give the identity of the structure.

• The structure is a villus (plural: villi).

b) What is the importance of the structure named in (a) above?

• The villus increases the surface area for absorption of digested food nutrients in the small intestine.

c) Name the parts labeled A, B and D.

• A: Lacteal
• B: Arteriole (part of the capillary network supplied by an artery)
• D: Vein (collects blood from the venule)

d) i) Name the juice secreted by the part labeled C.

• C represents the intestinal gland (crypt of Lieberkühn). The juice secreted is intestinal juice (or succus entericus).

d) ii) List two enzymes present in the juice named in d (i) above.

• Two enzymes present are:
  • Maltase
  • Peptidase (or Erepsin)
  • (Other possible answers include sucrase, lactase, lipase)

SECTION A (40 marks)
1. The diagram below represents the digestive system of man and the associated organs

a) Identify structure labeled C.

• C: Liver