Skin contains the protein keratin and cellular junctions called desmosomes that confer a mechanical strength to the epidermis, which such as punctures and abrasions.

resists mechanical traumas.

Explanation:

So, let us fill in the gap in the question above. Note that the capitalized words are the missing words to be filled in the gap.

"Skin contains the protein keratin and cellular junctions called desmosomes that confer a mechanical strength to the epidermis, which RESISTS MECHANICAL TRAUMA such as punctures and abrasions''.

Just as it is given in the question above, desmosomes is made up of keratin and cellular junction. The cellular junction is composed of multiproteins such as network of cadherin proteins. The main purpose of desmosomes is its provision in conferring mechanical strength and anchors for fibers.