00:00You're holding your breath for a photo.
00:0320 seconds in, you look like you're about to explode.
00:09While you hold your breath, oxygen drops slowly, but carbon dioxide builds up fast, and that buildup is the real
00:18trigger.
00:19Meet carbon dioxide, the gas your body actually cares about way more than oxygen when it comes to breathing.
00:30Your brain detects rising carbon dioxide and panics, sending urgent signals to blood vessels to widen and rush more blood
00:37to your face and skin.
00:41That surge of blood flow right under your skin's surface is what turns your face red.
00:49At the same time, your body's holding everything in, adding a little extra flush to your face along the way.
01:00So no, you're not secretly turning into a tomato.
01:03That's just carbon dioxide making its complaint heard, loudly, through your face.