USMLE Step 1 Respiratory Physiology Review 60 15 Terms of Oxygen Transport 1

USMLE Step 1 Respiratory Physiology Review 60 15 Terms of Oxygen Transport 1

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Play USMLE Audio MP3 60 15 Terms of Oxygen Transport 1 Below

Begin 60 15 Terms of Oxygen Transport 1 Transcription

What is hemoglobin called that has chemically combined with oxygen? The answer begins with an O.

  •  Oxyhemoglobin.

What is hemoglobin called after the oxygen it carries is released to the tissues? It starts with a D.

  •   After the oxygen carried by hemoglobin is released to the tissues the hemoglobin is called deoxyhemoglobin. 

What is another term for deoxyhemoglobin?

  • Reduced hemoglobin.

What is the name of the process by which reduced hemoglobin and oxygen combine to form oxyhemoglobin? The two word answer begins with LR.

  •  Loading reaction.

Where does the loading reaction occur?

  • The loading reaction occurs in the lungs at the respiratory membrane.

What is the process called when oxyhemoglobin releases the oxygen it carries and becomes deoxyhemoglobin?

  • Unloading reaction.

Where does the unloading reaction take place?

  • The unloading reaction takes place in the systemic capillaries.

When the oxyhemoglobin reaches the systemic capillaries, what causes the oxygen to unload into the tissues?

  •   The low PO2 of the tissues causes the oxygen to unload.

Why is oxygen tension in the tissues so low?

  •  The metabolism that occurs in the tissues consumes oxygen.

Student doctor please pause the tape and summarize what we’ve discussed about oxyhemoglobin, deoxyhemoglobin, and the loading and unloading reactions.

  • Hemoglobin that has chemically combined with oxygen is called oxyhemoglobin. After the oxygen carried by hemoglobin is released to the tissues, the hemoglobin is called deoxyhemoglobin. Deoxyhemoglobin is also called reduced hemoglobin. The process by which reduced hemoglobin combines with oxygen is called the loading reaction. The loading reaction occurs in the lungs at the respiratory membrane. The unloading reaction is when oxyhemoglobin releases the oxygen it carries and becomes deoxyhemoglobin. The unloading reaction takes place in the systemic capillaries. When the oxyhemoglobin reaches the systemic capillaries, the low PO2 of the tissues causes the oxygen to unload into the tissues. Oxygen tension in the tissues is low because the metabolism that occurs in the tissues consumes oxygen.

 

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