Capillaries have thin, one-cell thick walls for short diffusion pathways and narrow lumens to slow blood flow, allowing more time for exchange. Pores between cells further increase diffusion rates and fluid movement.
Capillaries have thin, one-cell thick walls for short diffusion pathways and narrow lumens to slow blood flow, allowing more time for exchange. Pores between cells further increase diffusion rates and fluid movement.
| Front | Explain how the structure of capillaries is related to their function. ( 2 marks) |
|---|---|
| Back | walls / endothelium one cell thick / made of flattened cells; short diffusion pathway narrow lumen; reduces rate of flow / more time for diffusion; gaps / pores between cells (accept fenestrations between cells); increased rate of diffusion / fluid movement out of vessel; |
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