Blood - Red blood cells, formed by erythropoiesis, contain hemoglobin that transports respiratory gases - Hemoglobin

3 important questions on Blood - Red blood cells, formed by erythropoiesis, contain hemoglobin that transports respiratory gases - Hemoglobin

What is hemoglobin's structure?

Quaternary structure with two alpha and two beta chains of polypeptides. Each chain has a single heme molecule (non protein pigment complex that forms a ring). Heme units hold an iron ion that allows for oxygen molecule interaction.

Oxyhemoglobin (HbO2) vs Deoxyhemoglobin 

Oxyhemoglobin has an oxygen molecule bound to its heme units; blood is bright red.
The iron-oxygen interaction is weak and reversible, dissociation of oxygen leaves a hemoglobin molecule whose iron has no oxygen bound -> deoxyhemoglobin (blood is dark red).

What is fetal hemoglobin?

Binds oxygen more readily, allowing a fetus to steal oxygen from the maternal blodo stream at the plancea.

The question on the page originate from the summary of the following study material:

  • A unique study and practice tool
  • Never study anything twice again
  • Get the grades you hope for
  • 100% sure, 100% understanding
Remember faster, study better. Scientifically proven.
Trustpilot Logo