Question

Simple diffusion exchange is insufficient for transporting nutrients from the blood in the capillary across the endothelium to the cells of tissues. Describe how bulk flow enhances the exchange.

Answer 1

Bluk transport occurs via endocytosis and exocytosis. This allows larger molecules to be transported across the cell membrane.

Endocytosis involves taking the material inside the cell. While exocytosis involves the extrusion of the material to outside.

Other means of transport besides esimole diffusion are

- Facilitated diffusion which allows the transport of molecules via carrier proteins.

- Active transport which involves the transport of molecules against the concentration gradient.