What was one unique characteristic about cardiac muscle that was different from both of the other types of muscle tissue?

Answer AND Explanation:

The cardiac muscles form the wall of the heart. The fibres are made up of many cells, which are joined end to end through intercalated discs. They have more mitochondria than skeletal and smooth muscles. Cardiac muscle is myogenic meaning that the rhythmical contraction originates from within.

fumikage isn't really a bird, and tsuyu does have teeth. tsuyu has a transformation quirk which still allows her to be partially human. otherwise we'd have a large frog running around. fumikage has teeth because again, he isn't a bird. his head was a quirk mixture if i'm correct.