Hemoglobin

Cardiologist Dr. Doping tells about the problem of oxygen transport, excretion and respiration products blood oxygen binding. What is the problem of storing oxygen in a multicellular organism? What is a "heme"? As the atomic structure of the protein molecule responsible for connection of oxygen?

There are only 20 amino acids encoded by the genetic code, and none of these amino acids are not able to bind oxygen and definitely not able to connect it reversible. What can bind oxygen? It turns out that this is best made of metal ions such as copper ions or iron.

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Metal should be chemically oxygen carrier, but because that it itself is oxidized, it is necessary to prevent oxidation. Iron, which operates an oxygen carrier, is not free, it binds in a structure called "heme". This enables less oxidized iron.

If we consider the unborn child in the womb, he does not have access to oxygen. He has his own oxygen system, the blood passes through the placenta, where blood vessels are washed, but do not mix with the mother's blood vessels, and this is where oxygen is selected for the needs of the developing fetus.