In a healthy resting person, hemoglobin that is relatively O₂-poor is found mainly in systemic veins and the right side of the heart (right atrium, right ventricle, and pulmonary arteries).

Quick Scoop

Think of blood flow as a loop:

  1. Systemic arteries → tissues
    • Blood leaving the left ventricle through the aorta is O₂-rich (highly saturated hemoglobin).
  1. Tissues → systemic veins
    • As blood passes through capillaries in body tissues, cells extract oxygen.
    • Hemoglobin gives up some O₂, so venous blood returning from the body is relatively O₂-poor compared with arterial blood.
  1. Right heart and pulmonary arteries
    • This O₂-poor venous blood enters the right atrium , then the right ventricle , and is pumped into the pulmonary arteries on its way to the lungs.
    • In a healthy resting person, this is the major location of relatively deoxygenated hemoglobin.
  1. Lungs → pulmonary veins → left heart
    • In the lungs, hemoglobin re-loads O₂ and becomes O₂-rich again, then returns via pulmonary veins to the left atrium and left ventricle , ready to be pumped out to the body.

So if this is a multiple‑choice style question, the best answer is:

You would find relatively O₂‑poor hemoglobin in the systemic veins, right atrium, right ventricle, and pulmonary arteries of a healthy resting person.

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