PNB 2265 lab 8: transport Questions
and Answers.
microvilli structure - Answer for the brush border and contain enzymes that complete
digestion
what do brush border enzymes do in regards to glucose - Answer break down disaccharides
(sucrose, lactose, maltose) into monosaccharides (glucose, fructose, galactose)
what is inside villi - Answer lacteal and capillary network
what are the types of membrane transport - Answer active transport: using ATP to transport
molecules against their concentration gradient
-primary: uses energy from ATP directly
-secondary: uses energy from concentration gradient created by primary active transport
passive: transporting a molecule down its concentration gradient using no ATP (non-polar and
lipophilic molecules)
facilitated diffusion: passive transport with a carrier protein (glucose/amino acids)
what are the 3 mechanisms for glucose transport? - Answer 1- primary active transport via
Na/K pump in the basal membrane
2- secondary active transport by Na/ glucose transporter in apical membrane
3- facilitated diffusion by glucose transporter in the basal membrane
(kinda in this order)
what does the Na/K pump do? - Answer creates a concentration gradient by moving 3 Na out
and 2 K+ in
maintains low intracellular Na (so that it favors the movement of Na in, and the Na/glucose
transporter can work)
what is another name for the Na/glucose transporter? how does it work - Answer SGLT
-it is a symporter and brings in Na down its concentration gradient, with glucose
and Answers.
microvilli structure - Answer for the brush border and contain enzymes that complete
digestion
what do brush border enzymes do in regards to glucose - Answer break down disaccharides
(sucrose, lactose, maltose) into monosaccharides (glucose, fructose, galactose)
what is inside villi - Answer lacteal and capillary network
what are the types of membrane transport - Answer active transport: using ATP to transport
molecules against their concentration gradient
-primary: uses energy from ATP directly
-secondary: uses energy from concentration gradient created by primary active transport
passive: transporting a molecule down its concentration gradient using no ATP (non-polar and
lipophilic molecules)
facilitated diffusion: passive transport with a carrier protein (glucose/amino acids)
what are the 3 mechanisms for glucose transport? - Answer 1- primary active transport via
Na/K pump in the basal membrane
2- secondary active transport by Na/ glucose transporter in apical membrane
3- facilitated diffusion by glucose transporter in the basal membrane
(kinda in this order)
what does the Na/K pump do? - Answer creates a concentration gradient by moving 3 Na out
and 2 K+ in
maintains low intracellular Na (so that it favors the movement of Na in, and the Na/glucose
transporter can work)
what is another name for the Na/glucose transporter? how does it work - Answer SGLT
-it is a symporter and brings in Na down its concentration gradient, with glucose
