Transcript Digestive System - Fort Bend ISD / Homepage

1. At times the level of
glucose rises above the
set point
2. When this happens
the pancreases
secretes insulin a
hormone into the blood.
3. Insulin enhances the
transport of glucose
into body cells to store
glucose as glycogen.
As a result, the blood
glucose drops
4. At others times, the
glucose level falls
below the set point.
Mutant gene for appetite
Giraffe eating bones to
obtain phosphorus
Essential Fatty Acids
• Unsaturated fatty acids
• Example linoleic acid (required for plasma
membrane structure)
Vitamins
• ORGANIC molecules
• Water soluble and fat soluble
• Example: B, B2, B6, B12, C, Biotin
Minerals
• INORGANIC nutrients
• Need less than 1mg – 2500 mg / day
• Example Ca, P, Mg
Suspension-feeding
Substrate-feeding
Fluid-feeding
Bulk-feeding
Intracellular
Digestion
Extracellular
digestion
Various alimentary canals
Oral sphincter
sphincter
ileocecal
sphincter
anal sphincter
Rugae
zymogens in the
small intestine
HCl
Pepsinogen
pepsin
enteropeptidase
trypsinogen
trypsin
trypsin
procarboxypeptidase
carboxypeptidase
trypsin
chymotrypsinogen
chymotrypsin
zymogens must be secreted in an inactive form and
then be activated
Absorption of nutrients
Glucose-facilitated diffusion amino acids-active transport & FD
glycerol & fatty acids-diffusion
vitamins and minerals-active transport