Which debilitating brain disorder commonly causes changes in personality, mood, or behavior and for which there is no cure?

Heat exhaustion is best described as:

A) a mild state of shock due to excessive fluid loss in a hot, humid environment. B) significantly increased body temperature due to failure of heat-regulating mechanisms. C) painful spasms of the muscles due to excessive electrolyte loss. D) seizures due to loss of fluids and electrolytes in a hot, humid environment.

________ is the measure of the amount of a drug that is still active after it reaches its target tissue

A) Biotransformation B) Concentration C) Bioavailability D) Metabolism