Simple answer: Donation of organs/tissue Fulfills priority of saving human life
Detailed Answer [click]
Everything in Islam is based on a priority basis.
There is a simple and easy understanding to everything in this life. Almighty God tells us it is He, Who has brought forth all life and it is He who causes death.
The first Haqq (priority of rights) in Islam is, all worship must be for Allah, as the One and only God, with no other gods beside Him. Following this the prophets of Almighty God have the next right to be followed and obeyed, peace be upon them all
After this, begins the Haqq (rights in Islam) for the rest of creation, the first of those being human life.
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