How is glucose transported into epithelial cells of the small intestine?
Whether a cell uses facilitated diffusion or active transport depends on the specific needs of the cell. For example, the sugar glucose is transported by active transport from the gut into intestinal epithelial cells, but by facilitated diffusion across the membrane of red blood cells.
Epithelia form linings throughout the body. In the small intestine, for instance, the simple columnar epithelium forms a barrier that separates the lumen from the internal environment of the body (note that the internal environment in which body cells exist is the extracellular fluid or ECF). The epithelium forms a barrier because cells are linked by tight junctions, which prevent many substances from diffusing between adjacent cells. For a substance to cross the epithelium, it must be transported across the cell's plasma membranes by membrane transporters.
Not only do tight junctions limit the flow of substances between cells, they also define compartments in the plasma membrane. The apical
_______ ______ _________ ____ ______ ______ _______ ______.
___ _________ ___ ____ ______ ________ ______ _____ ______ _______.
________ _____ _______ ______ ______ _____ _________ ____ ____ _________.
_______ _____ ______ ________ _________ _______ _______ _____ _______ ______ __________.
________ ___ _________ _____ ________ _________.
____ ______ _______ _____ ______ __________ _______ ____ ___ ______ _________ __________.
___ _____ __________ _________ ____.
______ _____ ___ ____ _______ _________.
_________ __________ ______ _____ __________ __________ ________ _______ _____.
_________ _____ _____ __________ _________ _________ _______ ________ ____ ____ _____.
_____ _____ _______ ______ _________ ____ ______ __________ _______ ______ ______ ______.
____ _________ ___ ______ _____ _______ ____ _________ ________ _____.
____ ____ ____ ________ _____ _____ _______ _________ ___ ________ _________ ______.
_______ ____ ____ ________ ______ _____ _____ _____ _____ _________.
_________ _____ ________ _______ _______ _______ ______ __________ __________ ___.
_____ ________ ________ ___ __________ _______ _______ ___ ___ ____.
______ __________ __________ ___ ______.
_____ ___ _________ _________ _______ _________ _______ _______.
_________ _______ __________ ______ _______ ____.
_____ _________ ___ ____ ____ _________ __________.
___ ________ __________ _____ _____ __________ ________ ________ ______ ___.
_________ _________ _______ __________ ____ ______ ________ ___.
____ _____ _______ ____ __________.
__________ _____ ______ ________ ____ _________ ______ _______ ___.
____ _____ ______ ________ _________ ______.
___ ____ _________ ______ ______ ______ _____ _______.
__________ ______ ________ _____ _________ _______ __________ _________ _____ ________ ____.
____ __________ __________ _____ ____ _________ __________ ________.
__________ _______ ______ ____ _______ ______ ________.
__________ ______ _________ _____ __________ ____ ___ _________ _____.
____ _________.
- Solved Assignments
- Study Notes
- Guess Papers
- Question Papers
✓ Unlock up to 60% of the answer
✓ No payment required