Briefly describe how oxygen arrives at the heart and then reaches cells in your kidneys?

Oxygen enters the body through the lungs during inhalation. From the lungs, oxygen-rich blood is pumped by the heart through the aorta, the main artery of the body. The aorta branches into smaller arteries, which deliver oxygenated blood to various organs and tissues, including the kidneys.

Within the kidneys, the renal arteries branch into smaller arterioles and capillaries, the smallest blood vessels, which form a network around the nephrons, the functional units of the kidneys. Oxygen diffuses from the capillaries into the surrounding kidney tissue, reaching the individual cells within the kidneys.

The oxygenated blood leaving the kidneys returns to the heart through the renal veins and then circulates to other parts of the body via the vena cava, the large vein that carries deoxygenated blood back to the heart.