Canonically, we already know that Klingons have a system of physiological redundancy called brak'lul, which involves a backup for most bodily functions, extra organs, extra heart chambers, extra ribs, etc. For a species that lives by battle and combat, this system would definitely be useful for survival.
This is just the first time they have specifically gone... there.
Kor
This is just the first time they have specifically gone... there.

Kor