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Difficulty: HardAnimal Nutrition and Digestive System

Match each digestive secretion or enzyme of the mammalian alimentary canal with its primary physiological function or mode of action in animal nutrition.

  • Bile saltsEmulsifies fats into fine globules to increase surface area for pancreatic lipase
  • Enterokinase (Enteropeptidase)Converts inactive pancreatic trypsinogen into active trypsin in the duodenum
  • Ptyalin (Salivary amylase)Hydrolyzes cooked starch into maltose under slightly alkaline to neutral pH
  • Rennin (Chymosin)Coagulates soluble milk protein caseinogen into insoluble casein in young mammals

Answer

Bile salts pair with lipid emulsification; Enterokinase pairs with trypsinogen activation; Ptyalin pairs with starch hydrolysis to maltose; Rennin pairs with caseinogen coagulation.
Each secretion or enzyme fulfills a distinct biochemical function: bile salts physically emulsify fats to assist lipase, enterokinase converts inactive trypsinogen into active trypsin in the small intestine, ptyalin hydrolyzes starch to maltose in the buccal cavity, and rennin precipitates milk protein in juvenile stomachs.

Step-by-Step Solution

1
Identify the non-enzymatic role of liver secretions in fat digestion.
Bile salts reduce lipid surface tension without chemical cleavage, performing emulsification.
Increasing the lipid surface area enhances subsequent chemical digestion by lipase.
2
Determine the activation cascade of pancreatic proteolytic enzymes.
Enterokinase, secreted by the succus entericus, activates trypsinogen to trypsin.
Proteolytic enzymes are produced as inactive zymogens to prevent autolysis of gland tissues.
3
Analyze carbohydrate hydrolysis in the anterior alimentary canal.
Ptyalin (salivary amylase) breaks down cooked starch to maltose.
Amylase acts specifically on alpha-1,4 glycosidic bonds in cooked carbohydrates.
4
Examine specialized gastric protein digestion in young mammals.
Rennin converts soluble caseinogen to insoluble casein in the presence of calcium ions.
Precipitating milk protein slows gut transit time so pepsin can effectively digest it.

Key Concept

Digestive Secretions, Enzymes, and Functional Specificity
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Topics

Animal Nutrition and Digestive System

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