Question

What is Ferritin?

• A. It is an iron storage protein in muscle fibers, liver cells and macrophages of the spleen and liver. Iron detaches from transferrin and attaches to ferritin.
• B. It is a non-iron portion of heme which is converted to biliverdin.
• C. It is plasma protein which transfers free iron into the blood stream.
• D. It is an iron-containing molecule which transports oxygen from the blood stream to the tissues.

Hint:

Remember the key proteins in iron metabolism:

\textbf{Hemoglobin}: Oxygen \textbf{transport} in blood.
\textbf{Transferrin}: Iron \textbf{transport} in blood.
\textbf{Ferritin}: Iron \textbf{storage} in cells. \end{itemize}

Answer 1

The Correct Option is A

Step 1: Concept Overview:
The question requires identifying the definition of ferritin, a crucial protein in iron metabolism.

Step 2: Option Analysis:
- Statement 1: Correct. Ferritin is the main intracellular iron storage protein, primarily located in the liver, spleen, and skeletal muscle. Transferrin transports iron in the blood; ferritin receives iron released from transferrin for storage within cells.
- Statement 2: Describes heme breakdown from hemoglobin, where iron is removed, and the porphyrin ring converts to biliverdin, then bilirubin.
- Statement 3: Describes Transferrin, the primary plasma protein responsible for iron transport in the bloodstream.
- Statement 4: Describes Hemoglobin, the red blood cell protein containing iron in heme groups, responsible for oxygen transport.

Step 3: Conclusion:
Ferritin is most accurately described as the primary intracellular iron storage protein. Thus, option (A) is the correct answer.