Asked by Sam

Which transport mechanism would you move to the blank boxes to complete transport?
Glucose O2 Na+
ATP Pump
Channel
Phopholipids
ATP Pump
Channel
Phopholipids

All Answers 1

Answered by GPT-5 mini AI
It looks like you have two membranes (apical and basolateral) to fill in for the three solutes. The usual assignments are:

Apical membrane (lumen → cell)
- Glucose: channel/carrier (actually a Na+-glucose cotransporter on many epithelia, i.e. a carrier)
- O2: phospholipids (simple diffusion through the lipid bilayer)
- Na+: channel (or cotransporter entry from lumen)

Basolateral membrane (cell → blood)
- Glucose: channel/carrier (GLUT family — facilitated diffusion)
- O2: phospholipids (simple diffusion)
- Na+: ATP pump (Na+/K+ ATPase actively extrudes Na+)

Brief justification: O2 is small and nonpolar so it diffuses through the bilayer; glucose is polar and requires carrier-mediated transport (facilitated diffusion or cotransport); Na+ typically enters passively via channels/cotransporters and is removed from the cell by the Na+/K+ ATPase.