We first encountered phagocytosis in concept 7.5, but it plays an important role in the immune systems of both invertebrates and vertebrates. briefly explain the process.

Phagocytosis is when a cell encloses a particle completely to form  a phagosome. The process was originally evolved for the acquisition of nutrients by certain specialised cells. In multicellular animals, the process has been adapted to form a part of the immune system. Here, debris and pathogens are ingested by a macrophage, which then fuses with a lysosome to form a phagolysosome. Here, enzymes and toxic peroxides digest the pathogen. 

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answer; both surfaces of the membrane are nonpermeable