Midterm paper

MODULE 10 LO4 Digestive System: Large Intestinal Functions Dr. Lisa Brinn [email protected]

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Large Intestine Digestive Functions • Finish absorption of nutrients • Absorption of water and electrolytes • Form feces • Eliminate feces from the body

vThrough anus

Mechanical Digestion • Trigger:

• Chyme in the stomach → peristalsis in ileum → chyme enters cecum • Chyme in cecum

• Initiates peristalsis in colon • Types of movements:

A. Peristalsis B. Haustral contraction C. Mass movement

• Gastrocolic reflex • Defecation

• Valsalva’s maneuver

Chemical Digestion • Glands secrete mucus

v Not enzymes • Chemical digestion

v Bacteria o Process known as saccharolytic fermentation

Ø Bacteria break down carbohydrates ↓ Ø Products: hydrogen, CO2, methane gases ↓ flatus → flatulence (excessive flatus)