1. BIO 211 Chapter 26
Beth Wyatt

9. ENZYMES Definition Chemical Structure: Proteins Whole
Organic Catalysts
Insurance that Chemical Reactions in Organisms Will Occur
Organized into 2 Groups
Intracellular: Most
Extracellular: Digestive Enzymes
Chemical Structure: Proteins
Whole
Partial (Nonprotein Portion Attached)
Ex: Vitamin, Electrolyte

10. PROPERTIES Specific in Action: Lock and Key (Enzyme/Substrate)
Function Optimally at Specific pH
Ex: Pepsin
If pH Changes
1) Enzyme Becomes Less Active (Inhibited)
2) Enzyme Becomes Inactive (Inactivated)
*Enzyme Becomes Denatured
Inactivated/Inhibited by Various Agents
Physical: Heat, pH
Chemical: Drugs

12. DIGESTIVE ENZYMES (NAMES)*
Enzymes that Digest Carbohydrates:
Amylase, Sucrase, Lactase, Maltase
Enzymes That Digest Proteins:
Proteases: Pepsin, Trypsin, Peptidases
Enzymes That Digest Fats:
Lipase
*Names Usually End in “Ase”
*Enzyme’s Name = Substrate’s Name + “Ase”

15. SUMMARY: FUNCTIONS OF HORMONES and the EG REFLEX GIP & Enterogastric Reflex: Inhibits Gastric Motility Inhibits Secretion of Gastric Juice Gastrin: Stimulates the Secretion of GJ

16. CCK & Secretin: Inhibits Secretion of GJ Stimulates Secretion of Pancreatic Juice (CCK: Enzyme,Secretin:Bicarb) Stimulates Ejection of Bile from GB CCK: Stimulates Intestinal Motility VIP: Stimulates Secretion of Intestinal Juice