A waste gas that is trnsported in the veins from body to lungs via heart?

The waste gas that is transported in the veins from the body to the lungs via the heart is carbon dioxide (CO2).

During cellular respiration, which occurs in the cells of the body's tissues, glucose is broken down to produce energy. As a byproduct of this process, carbon dioxide is released. The carbon dioxide diffuses into the bloodstream from the tissues and is then transported to the lungs via the veins.

In the lungs, the carbon dioxide is exchanged for oxygen through a process called gas exchange. The oxygen binds to hemoglobin in the red blood cells, while the carbon dioxide diffuses out of the lungs and into the atmosphere.

The heart plays a crucial role in transporting the carbon dioxide-rich blood from the body to the lungs and the oxygen-rich blood from the lungs to the body. The right side of the heart collects the deoxygenated blood from the body through the superior and inferior vena cavae and pumps it to the lungs. The left side of the heart receives the oxygenated blood from the lungs and pumps it out to the rest of the body through the aorta.