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Asked Feb 8, 2019
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Explaining 'tracing a drop of oxygen from the left atrium.'

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Step 1

The question asks the explanation for 'tracing a drop of oxygen from the left atrium'. It means to explain the pathway of oxygen from the left atrium of the heart to the cellular respiration in mitochondria.

Step 2

The left atrium is a chamber out of the four heart chambers. It is present on the left posterior side of the heart. Oxygen-rich blood enters it from the lungs through the pulmonary vein.

Conversion of oxygen-poor blood to Oxygen-rich blood:

Deoxygenated blood arrives in the lungs. The alveoli are the small air pouches in the lung. There the oxygen gets diffused into the blood through small blood vessels (capillaries). While the carbon-dioxide leaves the blood. Here, the deoxygenated blood becomes oxygenated (with oxygen).

Step 3

The pathway of oxygen from the left atrium of the heart to cellular respiration in mitochondria can be studied under the two following steps:

  1. Movement of Oxygenated blood from left atrium to mitochondria:

This oxygenated blood then comes back to the heart from the lungs. It comes back through the left and right pulmonary veins in the left atrium of the heart. This oxygenated blood flows across the bicuspid valve to enter in the left ventricle. Oxygen-rich blood then leaves the left ventricle via the aortic valve which then enters the aorta. The largest artery is Aorta in the body. Then this blood flows from aorta throughout the body by the help of arteries. These arteries get branched and turn out to be smaller and smaller. Each major organ contains its own set of arteries and veins. Oxygen travel...

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