Question

where does the carbon dioxide you exhale come from?

Answer 1

From the plants and trees around us

Answer 2

wait hold on think i read the question wrong

Answer 3

It comes from the air that you inhale.
Air is a mix of many gases. When you breathe it in, your lungs take some of the oxygen and then the rest of the oxygen and other gases your body doesnt need, are exhailed (including carbon dioxide or CO2)

Answer 4

it comes from the used blood that leaves the heart via the pulmonary artery to the lungs..so it meets 0xygen there and it exchanges.the oxygen goes to the blood and d lungs take the co2 and pass it out.

Answer 5

when you do cellular respiration, you breathe in oxygen and breathe out co2 so basically the mitochondria

Answer 6

it's the product from the oxidation of carbon-containing compounds (e.g. glucose) in the tricarboxylic acid cycle.