Many sports teams encourage their players to drink sports drinks during competition instead of pure water. Given what is known about the types of thirst, why is this a good idea?
What will be an ideal response?
There are two types of thirst: osmotic and hypovolemic. For many athletes, while they are performing their sport, they lose a significant amount of body fluid by sweating. As a result, they experience hypovolemic thirst. Without sufficient blood volume, the heart has trouble pumping blood (and needed nutrients) to the brain. As such, the kidneys will release renin, which ultimately gets converted into Angiotensin II (which constricts blood vessels and stimulates cells in the SFO to increase drinking). Whereas a person with osmotic thirst needs water, an athlete with hypovolemic thirst cannot drink much pure water. Pure water would dilute his/her body fluids and lower the solute concentration in the blood. The person therefore increases his/her preference for salty water. Therefore, athletes tend to drink sports drinks, which contain salts and other nutrients in the water.
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