Originally Posted by These guys

The above pretty much sums it up.

When we look closely at a flower, we see that it is made up of many smaller components, eventually down to the microscopic level. When they're examined closely, we can indentify these individual parts which make up the whole. When we examine big picture, it is simply a
flower.

Just because the process of choice takes place as a result of chemical reactions and electrical impulses doesn't make free will non existent, it is simply the make up of it, the very structure, the building blocks of free will itself.