water has one of the largest specific heats of any substance. Why is this important for the human body?

Answer 1

The high specific heat of water means that a large amount of heat energy can be put into water before it undergoes a change in temperature. This is important to the human body because the body is composed mostly of water. Normal body temperature must be maintained, and if it isn't a variety of problems can result (which are beyond the scope of this question to discuss...suffice to say, it is imporant to avoid drastic changes in body temperature). Sine water has a high specific heat, it does an excellent job of resisting drastic elevations in temperature, thereby helping to prevent changes in body temperature.

Answer 2

Water. It is hard to change the temperature of the body, because ~90% of it is water, whose temperature is hard to change.