La tasa de alcohol en sangre permitida para conductores es de 0,5 g/L. Una persona se toma una lata de cerveza (33 cL) que posee un 4% en volumen de alcohol. Admitiendo que el volumen total de sangre de esa persona es de unos 6 L, ¿daría positivo si lo paran en un control? (densidad del alcohol = 0,79 g/mL).

You exhale co2 which is produced during cellular respiration.  co2 combines with the water in your blood's plasma to make up one half of the body's most important buffer pair, carbonic acid.  the more physical activity you engage in, the more co2 your body is producing.  you can see this by putting some of the cabbage indicator in a glass and then blowing bubbles into it through a straw.  can you see a change in the color of the indicator?