BIOL123 Lecture Notes - Lecture 20: Active Transport
17 Jun 2018
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5.10 Describe the structure common to all epithelial membranes
• Typical features:
o Lots of cells bound closely together
o Not much extracellular material
o Exposed and attached surfaces
o Epithelia rest on a basement membrane
o Avascular - no bloody supply (how to they get their nutrients and remove their
waste)
o Regenerative
5.11 Describe the relationship between the amount of cytoplasm of an epithelial cell and the
amount of work done by such cells
• More cytoplasm = more mitochondria = more active transport
• Squamous = small amount of cytoplasm
• Cuboidal = bit more of cytoplasm
• Columnar = most amount of cytoplasm
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