@ CG
Anatomically, the human body is quite fragile, yet can withtand several bullets. Remember the pope (John paul II) took a couple in the chest, yet survived. Assuming no major nerve centre (should as the shoulder or groin, bone or the arterial system is damaged, survival is quite likely considering modern medicine. The major organs are all within the chest cavity, and some can withstand damage without. The liver, spleen and heart/lungs are all blood-heavy organs that will lead to exsanguination when damaged. I have no idea of how this relates to a combat situation, but I would guess that without a critical hit to major systems, short term fighting may be possible.
Funnily enough I had this exact same conversation with a medical student friend of mine.
The human body is quite fascinating, fragile yet still damage resistant.