In a resting person, how many O2 molecules are attached to each hemoglobin molecule, in blood in the pulmonary arteries?  In blood, in the pulmonary veins?

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I would like to add a few thoughts. The heart can be divided into a left side and a right side. The right side of the heart has a very low oxygen content because the oxygen contained on the hemoglobin molecules has been delivered to the cells of the body....

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In human circulation all blood is returned to the right atrium of the heart after it has circulated throughout the body. The left side of the heart has a very high oxygen content because when blood leaves the right ventricle it travels to the lungs via the pulmonary arteries. In the lungs the blood picks up oxygen and gets rid of carbon dioxide. When the blood leaves the lungs it travels to the left atrium and then the left ventricle before passing this oxygen rich blood to the rest of the body.

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Hemoglobin is a protein molecule in red blood cells that binds oxygen to the red blood cell and enables the blood to deliver that oxygen to all the cells in the body.  Hemoglobin accounts for up to 3% of teh dry weight of red blood cells.  It can bind 4 oxygen molecules in the pulmonary artery.  In the pulmonary vein, the oxygen has been delivered, and the hemoglobin picks up the carbon dioxide, which is a waste product created by the process of cellular respiration.  Each hemoglobin protein can bind up to 4 carbon dioxide molecules, which will be delivered to the lungs and exhaled, which rids the body of the carbon dioxide.  Blood is normally a dark red while contained within the enclosed circulatory system.  When a person gets a cut, blood oozes from the capillaries and turns a bright ruby red, courtesy of the hemoglobin molecule binding with oxygen molecules in the air.

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In a resting person, how many O2 molecules attached to each hemoglobin molecule on average in blood and in pulmonary arteries?How many attach in blood in the pulmonary veins? Pulmonary System.

Erythrocyes (red blood cells) carry the hemogoblin molecule. Oxygen is transported on the hemoglobin molecule. An average hemoglobin for an adult male is approximately 12 grams/dl.

All blood has hemoglobin and therefore some oxygen content but the arterial system has a higher percentage of hemoglobin compared to the venous system.  In other words, the number of oxygen molecules is much higher in an artery than in a vein. The one exception to this are the pulmonary arteries and veins. Pulmonary arteries carry oxygen poor blood to the lungs from the right ventricle. Pulmonary veins carry oxygen rich blood (because the blood just left the lungs) to the left atrium.

In a relatively healthy individual, the arterial blood is said to be saturated with oxygen at around 97-100 %. Again, a venous sample would be much lower than that.

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