One of the roles of iron in the human body is to:
A) promote the breakdown of older bones.
B) provide structural rigidity to proteins.
C) transport oxygen and carbon dioxide in the blood.
D) help in the elimination of water.
Question 2
_____ is an intestinal protein that regulates the amount of zinc released into the blood.
A) Insulin
B) Ceruloplasmin
C) Metallothionine
D) Myoglobin