I am not sure, but I believe your answer is A. 5-15
As far as I know there isn't a way to directly heal one. You just gotta wait it out.
But a good way to make it not feel itchy is to put tiger balm on it, or you can use a bandaid!
The cells in the heart need a constant supply of nutrients / oxygen and to get rid of their waste products ans that why it needs its own special circulatory system.
The right chamber( right atrium)
