Digestive enzymes and their functions — KCSE Biology

Digestive enzymes play a crucial role in breaking down food substances into absorbable units. Here are key enzymes, their substrates, and products:

• Amylase:

  • Substrate: Starch
  • Product: Maltose (and dextrins)

• Protease:

  • Substrate: Proteins
  • Product: Amino acids (and peptides)

• Lipase:

  • Substrate: Lipids (fats)
  • Product: Fatty acids and glycerol

• Lactase:

  • Substrate: Lactose
  • Product: Glucose and galactose

These enzymes are secreted by various organs in the digestive system, including the salivary glands, stomach, pancreas, and small intestine. Understanding the specific substrates and products of these enzymes is important for grasping how digestion occurs effectively in the human body.

Digestive enzymes are biological catalysts that speed up the breakdown of food substances into smaller, absorbable components. They are secreted by various organs in the digestive system. Here are the main types of digestive enzymes and their functions:

• Amylase: Produced in the saliva and pancreas; it breaks down starch into sugars.
• Protease: Secreted by the stomach and pancreas; it digests proteins into amino acids.
• Lipase: Produced by the pancreas; it breaks down fats into fatty acids and glycerol.

Each enzyme works optimally at specific pH levels. For example, pepsin (a protease) functions best in the acidic environment of the stomach, while pancreatic amylase works in the alkaline environment of the small intestine.

Understanding these enzymes is crucial for grasping how nutrients are absorbed in the body, as they facilitate the conversion of complex food molecules into simpler forms that can be utilized by cells.