what is hemoglobin?
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what is hemoglobin?
Molar Mass-
≈64,500
The average molar mass of an entire mammalian hemoglobin molecule is ≈64,500.
Structure
Hemoglobin comprises four subunits, each having one polypeptide chain and one heme group (Figure 1). All hemoglobins carry the same prosthetic heme group iron protoporphyrin IX associated with a polypeptide chain of 141 (alpha) and 146 (beta) amino acid residues.
Normal range
The normal range for hemoglobin is: For men, 13.5 to 17.5 grams per deciliter. For women, 12.0 to 15.5 grams per deciliter.
Oxygen
Each subunit surrounds a central heme group that contains iron and binds one oxygen molecule, allowing each hemoglobin molecule to bind four oxygen molecules. ... Iron associated with the heme binds oxygen. It is the iron in hemoglobin that gives blood its red color.
About 70 percent of your body's iron is found in the red blood cells of your blood called hemoglobin and in muscle cells called myoglobin. Hemoglobin is essential for transferring oxygen in your blood from the lungs to the tissues. Myoglobin, in muscle cells, accepts, stores, transports and releases oxygen.
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