In the case of animals, these exchanges occur in the capillaries.
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Plants give off waste as a products through photosynthesis. These wastes include but are not limited to oxygen the gas.
They "excrete" oxygen, which for them is a waste product. They "excrete" oxygen, which for them is a waste product.
The circulatory system
there are two types of wastes products produced by plants a)gaseous B)liquid Gaseous wastes include carbon dioxide(CO2) and oxygen(O2). While the former is produced during the respiration of the plant, the latter is produced in a process called photosynthesis. Liquid waste is water(H2O) Both of these wastes are removed by stomata.
Even though the air travels from bronchi to bronchiole to alveoli to have the gase exchanged, the REAL gas exchange happens in the capillary that is on the alveoli. This is where the blood that is carrying CO2 exchanges it with O2 to supply the rest of the body. Without the circulatory system... Well first of all you're going to die without the circulatory system, but for this topic, if you don't have the circulatory system, then the oxygen cannot be exchanged with CO2 and you're body will die from lack of oxygen.