The heme "assembly line" is an eight-step process, requiring eight different and properly functioning enzymes.
It is complex, various chemical signals can trigger increased or decreased production. These signals can affect the enzymes themselves or the production of these enzymes, at the genetic level.
6
move to shipping area
4 steps
4 molecules of oxygen - one to each subunit on the heme
3
23 =)
5
23 =)
10
There are many steps involved in making a movie. Among the first steps, there are coming up with the concept and writing the script.
In a simplified pencil sharpener, there are typically two main steps involved: inserting the pencil into the sharpener and turning the handle to sharpen the pencil.