What is meant by shed in this context?

Mucous membranes are the layers of epithelial cells that line internal organs and form a barrier against the external environment.
These membranes secrete mucous in some locations.
Microorganisms that become trapped in this sticky fluid are shed from the epithelial surface.

 

does it meant to drop from?

My guess is 'carried away'.

Like String Junky said. In the tubes lined with mucous membrane, whether respiratory or digestive in their function, viruses, bacteria and fungi are a constant danger. They have to be kept out of the vulnerable organs, such as lungs. That's what the mucus is for: to trap foreign material so it can be flushed away as snot or swallowed with the saliva.  

Shed like fur from a dog falling to the floor, not a small structure used for storing garden tools 

Edited September 15, 20223 yr by iNow