Page 51 - Biology Form Two

Biology for Secondary Schools

Digestion in the ileum Lipase
Task 2.3 This enzyme catalyses the conversion
of the remaining fats and oils into fatty
Search the library and internet sources acid and glycerol.
for information on end products of Maltase
FOR ONLINE READING ONLY
digestion in human. Prepare a short It catalyses the conversion of maltose
report about what you have searched. into glucose.

Sucrase
The ileum is the final part of the small
intestine. The process of digestion ends It catalyses the conversion of sucrose
into glucose and fructose.
in the ileum. When chyme enters the
ileum, it stimulates the intestinal wall Lactase
of the ileum to secrete an intestinal It catalyses the conversion of lactose
into glucose and galactose.
juice known as succus entericus. This
contains digestive enzymes that finalise Peptidase
the digestion of proteins, carbohydrates It catalyses the conversion of the
remaining peptides into amino acids.
and lipids (fats and oils). The digestive

enzymes found in the ileum include the Table 2.1 shows a summary of the
following: enzymes involved in digestion and the
products of digestion in different parts of

the digestive system.

Table 2.1: Summary of enzymes involved in digestion and the products of
digestion in each part of the human digestive system

Part of Digestive Enzyme Substance Product of
digestive juice secreted digested digestion
system
Mouth Salivary Salivary Cooked starch Maltose
juice amylase (Carbohydrate)

Stomach Gastric juice Pepsin Proteins Peptides and
amino acids

Rennin Soluble milk protein Insoluble
(caseinogen) milk protein
(casein)

Student’s Book - Form Two 45

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BIOLOGY FORM 2 NEW.indd 45
BIOLOGY FORM 2 NEW.indd 45 05/10/2024 15:36:23