Download SMALL INTESTINE

SMALL
INTESTINE
Spaghetti time!
SMALL INTESTINE
• Roughly 20 feet
• Small in diameter
• Champion digester
• Absorbs
SMALL INTESTINE
• Has 3 main parts.
• 1. Duodenum
• 2. Jejunum
• 3. Ileum
Duodenum
Section 1
Duodenum
• First 10-12 inches after
the stomach. (12 fingers)
• (Duodenal ulcers)
Duodenum
• Chyme- STUFF released
from the stomach by the
pyloric sphincter.
• ACIDIC!!
Duodenum
• Bile
• Comes from the liver to
neutralize acid.
• Emulsifies fat
• Adds color to feces.
Duodenum
• Pancreatic Juice:
• Comes from pancreas
• Neutralizes acid
• Releases 3 BIG enzymes
Duodenum
• Amylase:
• Starch  maltose
Duodenum
• Trypsin:
• Proteins  peptides
Duodenum
• Lipase:
• Lipids  Fatty acids
& Glycerols
Jejunum
Section 2
Jejunum
• About 8 feet long
• BULK of nutrient
absorption
Jejunum
• Intestinal juice:
prepares food to be
absorbed.
Jejunum
• Further breakdown
• Peptidase:
• Peptides  amino
acids
Jejunum
• Maltase:
• Maltose  Glucose
Ileum
• About 12 feet long
• Connects to large
intestine
SMALL INTESTINE
• Color the villi and label
I, K, L, and M (Page
475)
Color code
• Color code the Villi
• I,K,L,M
SMALL INTESTINE
• Villi: Fingerlike
projections to increase
surface area
• X 600
VILLI
•
SMALL INTESTINE
• Crypts: Glands
between villi that
produce intestinal
juices.
SMALL INTESTINE
• Lacteal: Center of
villi, where FAT
products get absorbed.
SMALL INTESTINE
• Arteries and Veins:
Vessel network in each
villi, ABSORB amino
acids and glucose.
Veins and Arteries
Digestion & Absorbtion
• 3 Big classes (4 with
Nucleic acids)
• 1. Carbohydrates
• 2. Proteins
• 3. Lipids
Carbohydrates
• Start with Starch
•
STARCH
Maltose
AMYLASE
Carbohydrates
• Maltose
•
Glucose
Maltase
Carbohydrates
• Glucose
BLOOD
PROTEINS
• Start with Protein
•
PROTEIN
PEPTIDE
Trypsin
Proteins
PEPTIDE
Amino Acids
Peptidase
 BLOOD
LIPIDS FAT
• Start with fat
•
FAT
FAT DROPLET
BILE
LIPIDS
F. Droplets
LIPASE
Fatty Acids
Glycerols
 LACTEAL (Lymph System)