GI: Small Intestinal Secretions Flashcards
What do the Crypts of Lieberkuhn secrete?
Cl-
HCO3-
What do the Brush Border Enterocytes secrete?
Peptidases Sucrase Maltase Isomaltase Lactase Alpha-Dextrinase Intestinal Lipase
What do the Brunner Glands secrete?
Heavy alkaline mucus
What do the Goblet cells secrete?
Mucus
What does the Cl- in the SI do?
Makes watery fluid for easier absorption
What does the HCO3- in the SI do?
Makes watery fluid for easier absorption
Helps neutralize gastric acids
What does the Peptidases in the SI do?
Hydrolysis of Dipeptides and Tripeptides into Amino acids
What does the Sucrase in the SI do?
Hydrolysis of Sucrase –> Fructose + Glucose
What does the Maltase in the SI do?
Hydrolysis of Maltose –> Glucose x2
What does the Isomaltase in the SI do?
Hydrolysis of Saccharides not digested earlier
What does the Lactase in the SI do?
Hydrolysis of Lactose –> Galactose and Glucose
What does the Alpha-Dextrinase in the SI do?
Hydrolysis of terminal alpha-1,4 bonds to make Glucose
What does the Intestinal Lipase in the SI do?
Breakdown of Neutral fats into Fatty acids and Glycerol
What does the Heavy Alkaline Mucus in the SI do?
Protects duodenum from the large amounts of Gastric acid
What does the Mucus in the SI do?
Lubricates and protects Intestines
