Multiple choice general knowledge sports During sweating, which of the following goes down and goes up? Blood volume/the concentration of salts in your blood Weight/the muscle mass of the exercised region Water volume/adrenaline Your concentration/your susceptibility to injury Reveal answer Fill a bubble to check yourself A Correct answer Explanation When you sweat, you lose water, which decreases blood volume. Since the total amount of salts in your blood remains constant while blood volume decreases, the concentration of salts increases. This is why staying hydrated during exercise is crucial.