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DIGESTIVE PHYSIOLOGY (FOOD ABSORPTION (Absorption of amino acids and…
DIGESTIVE PHYSIOLOGY
FOOD ABSORPTION
Absorption of amino acids and glucose
via active transport
utilizing protein carriers
Digestion and absorption of lipids
emulsification of triglycerides, digestion by lipase, absorption into epithelial cells, cellular modification and formation of chyclomicrons, extrusion of chyclomicrons into lymphatic vessels and lacteal
Definition of food absorption
food absorption is the movement of end-products of digestion across the epithelial lining of the gut into the circulatory system
What are the molecules being absorbed?
glucose and galactose
amino acids
fructose
FFA(free fatty acids)
minerals
Minerals absorption
via facilitated diffusion
calcium absoption
FOOD DIGESTION
intracellular digestion
is defined as the breakdown of substances within the cytoplasm of cells
extracellular digestion
Digestive tracts
Midgut
Hindgut
Foregut
Organisms involved
ATHROPODS
VERTEBRATES
aves
herbivores
Hindgut fermenters(mono-gastric stomach)
Foregut fermenters(ruminants)
amphibians
mammals
fish
ANNELIDS
digestive process involves PERISTALSIS and SEGMENTATION
mouth
mono-gastric stomach
processes in stomach: SECRETION to DIGESTION to ABSORPTION
processes in small intestine: MOTILITY to SECRETION to DIGESTION
the ENZYMES involved in the DIGESTION and the enzymes CHARACTERISTICS
FOOD INTAKE
controls of food intake
the control mechanisms
short-term control via PRESSURE RECEPTORS
long-term control via FAT DEPOSITION
metabolites detection via HUNGER AND SATIETY and SENSORS
measuring food intake
measured using Voluntary Food Intake(VFI) or
ad libitium intake