BIOL 325 Nutrient Absorption

glucose and galactose across apical membrane

co-trasported w/ Na+

glucose and galactose across basolateral membrane

faciliated diffusion

fructose across apical membrane

facilitated diffusion

fructose across basolateral membrane

facilitated diffuction

amino acids across apical membrane

co-transported with Na+

amino acids across basolateral membrane

facilitated diffusion

dipeptide/tripeptide across apical membrane

co-transported with H+

dipeptide/tripeptide across basolateral membrane

facilitated diffusion

whole proteins across apical membrane

endocytosis

whole proteins across basolateral membrane

exocytosis

fatty acids/ monoglycerides across apical membrane

simple diffusion + form chylomicrons

fatty acids/ monoglycerides across basolateral membrane

exocytosis and enter lacteals and carried in lymph

nucleic acid bases across apical membrane

co-transported with Na+

nucleic acid bases across basolateral membrane

co-transported with Na+

phosphate across apical membrane

Na+ - P co transporter

phosphate across basolateral membrane

facilitated diffusion

vitamin A, D, E, K across apical membrane

simple diffusion (micelles)

vitamin B and C across apical membrane

facilitated diffusion or secondary active

vitamin B12 across apical membrane

intrinisic factor via endocytosis

vitamin K and B across apical membrane

bacterial metabolism

iron across apical membrane

secondary active transport w/ H+ (transferrin)

Ca2+ across apical membrane

channels

Na+ across apical membrane

channels or coupled with glucose/amino acids

Cl- across apical membrane

secondary active transport (Na+ or HCO3-)

K+ across apical membrane

paracellular with water