4.5 - Co-transport of Glucose in the Ileum Flashcards
The process of co-transport How co-transport is used in the absorption of glucose and amino acids
What are co-transporters?
Carrier proteins that bind to two molecules at once
How do co-transporters work?
Use the concentration gradient of one molecule to move another
Where is glucose absorbed during digestion?
From the small intestine into the bloodstream
How is glucose absorbed from the intestines into the blood?
Co-transport
What are the three proteins involved in glucose co-transport?
Sodium-potassium pumps
What do sodium-potassium pumps do?
Actively transport sodium and potassium ions
What do sodium-glucose co-transporter proteins do?
Use facilitated diffusion to transport sodium ions and glucose
What do glucose protein channels do?
Use facilitated diffusion to transport glucose molecules
How is sodium transported out of epithelial cells?
Actively by the sodium-potassium pump
What does the sodium-potassium pump create?
A concentration gradient of sodium ions
How does sodium move into epithelial cells?
By facilitated diffusion via sodium-glucose co-transporter proteins
What happens to glucose concentration inside epithelial cells?
It increases
How does glucose move out of epithelial cells?
By facilitated diffusion via glucose protein channels
Why is glucose movement considered co-transport?
It uses the sodium concentration gradient
What is used to maintain the sodium ion concentration gradient?
ATP
What other molecules are absorbed by the same process?
Amino acids
