When someone works out they don’t produce enough oxygen for energy, this then causes lactic acids to build up causing a burning feeling in your body.
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I almost wanna say the orange red green blue thing because that's what it looks like but maybe you'll get an answer from this
<span>C. Capillaries – work to exchange gases and nutrients with tissues
Arteries carry away the blood from the heart, these are the oxygen riched blood and of course the Aorta for that matter since the largest artery is the AORTA. Veins are the vessels that carry blood to the heart (Superior and Inferior Vena Cava)</span>
