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.
There could be many such agencies depending on the country. Chiefly they would be involved with factors other than direct production, such as safety, pollution, production standards, employment regulations etc.