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Heat causes the body to adapt in many ways as we require to maintain a steady internal temerature. An increase in heat causes us to sweat more, so that when the water evaporates it takes the heat with it to cool us down, maintaining Homeostasis. The water in the sweat has to come from somewhere and that somewhere is usually the blood. So if heat increases the water content of the blood plasma decreases, this means the pressure of the blood decreases. The term "thin" in relation to blood used to mean a low blood pressure but this term is archaic nowadays. Usually thickness in terms of a fluids is relates to Viscosity (higher the viscosity less runny). If the water is being removed from the blood then the concentration of everything in it is increasing (the Osmolarity is increasing), meaning its viscocity is increasing. So in these terms it is true to say that heat thickens the blood. In other words the terms thick and thin in relation to blood are so ambiguous they should not be used, blood pressure or osmolarity should be used depending on what is trying to be said.

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17y ago

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