By selecting shady or cool surroundings, an individual can avoid becoming overheated. In other cases, however, the body heat may become excessive. In such cases, if the body is to remain healthy, the surplus body heat must be removed.
a. Sweating. Sweat (perspiration) is made up primarily of water, with various substances dissolved in it. As one of its physical characteristics, water has a relatively high heat-carrying capacity. In addition, it evaporates from the surface of the body. Another physical characteristic of water is that it removes large numbers of calories during evaporation.
b. Radiation. In addition, heat can be radiated directly from the surfaces of the body. This is particularly true of the surfaces of the axillae (armpit areas), the inside of the elbow areas, and the groin. These are areas where the skin tends to be thinner than average.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.