Oxygen's journey through the body

The journey of oxygen through the body is a fascinating process that ensures the proper functioning of all our vital organs. From the moment we take a breath, oxygen embarks on a remarkable journey, traveling through various organs and tissues to reach its destination.
In this page, we will explore the intricate pathway of oxygen as it navigates through the respiratory and circulatory systems, highlighting the crucial role it plays in sustaining human life.

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During inhalation, oxygen enters the body through the nose or mouth as we take a breath.

Nasal Cavity and Trachea

The oxygen then passes through the nasal cavity and trachea, which help filter and warm the air.


In the lungs, oxygen is exchanged for carbon dioxide through the process of gas exchange.

Pulmonary Veins

The oxygen-rich blood is carried by the pulmonary veins from the lungs to the heart.

Left Atrium and Left Ventricle

In the heart, the oxygenated blood enters the left atrium and then the left ventricle.


From the left ventricle, the oxygen-rich blood is pumped into the aorta, the largest artery in the body.

Systemic Circulation

The oxygenated blood is then distributed to all the organs and tissues of the body through the systemic circulation.


In the capillaries, oxygen is delivered to the cells, and carbon dioxide is collected for removal.

Exchange for CO2

The oxygen diffuses into the cells, while carbon dioxide diffuses out of the cells and into the bloodstream.

Veins and Vena Cava

The carbon dioxide-rich blood is carried by the veins back to the heart, where it enters the right atrium and then the right ventricle.

Pulmonary Artery

From the right ventricle, the deoxygenated blood is pumped into the pulmonary artery.

Lungs (Exhalation)

In the lungs, carbon dioxide is expelled from the body through exhalation.

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