4. Active Transport

Question 1

factors affecting rate

Answer 1

speed of carrier protein
number of carrier proteins
rate of respiration (Availability of ATP)

Question 2

how does glucose enter ileum epithelium (to then go into blood stream)

Answer 2

1. Na+ active transport out of epithelium into blood by sodium potassium pump = concentration gradient more Na+ in lumen than in epithelial cells
2. Na+ diffuse from lumen into epithelial via sodium-glucose co-transporter proteins (carries glucose into cell, glucose inside cell increased)
3. glucose diffuse out of cell into blood by facilitated diffusion (through protein channel)