'In mind' (cos tego nie rozumiem) , 'i' ('I' piszemy wielka litera i to ZAWSZE) would thank my donor for a wonderful gift, for his heart.
I support (the ideas of?)transplants, because the transplant gives people a chance for a new life.
If I had a 'death' (lepiej FATAL) accident I would give my organs for transplant. (takie rzeczy lepiej uzgodnic 'przed', bo 'po' juz jest za pozno).