Which One of the Following Is TRUE Regarding the "Recycling

Multiple Choice

Which one of the following is TRUE regarding the "recycling" of hemoglobin?

A) The peptide chains are broken down into their constituent fatty acids.
B) The iron atoms are returned to the red bone marrow.
C) The heme groups are converted to urine by the kidneys.
D) The peptide chains are transported intact to the bone marrow for reuse.
E) The heme groups with their iron atoms are transported to the spleen.