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A-Level Biology OCR A

State Properties Functions Endothelium Blood Vessels Smooth Minimises

The endothelium in blood vessels is smooth to minimize friction, thin to facilitate exchange, and can have gaps between cells for filtration and white blood cell passage.

The endothelium in blood vessels is smooth to minimize friction, thin to facilitate exchange, and can have gaps between cells for filtration and white blood cell passage.

Front State properties and functions of endothelium in blood vessels.
Back Endothelium:
  • Smooth – minimises friction
  • Thin – can be a good exchange surface if nothing else gets in the way
  • There can be gaps between cells for filtration (and allowing WBCs into tissues) 

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