Thermoregulatory Control

In discussions of control systems, the words "regulation" and "regulate" have meanings distinct from those of the word "control" (see Chapter 1). The variable that a control system acts to maintain within narrow limits (e.g., temperature) is called the regulated variable, and the quantities it controls to accomplish this (e.g., sweating rate, skin blood flow, metabolic rate, and thermoregulatory behavior) are called controlled variables.

Humans have two distinct subsystems for regulating body temperature: behavioral thermoregulation and physiological thermoregulation. Behavioral thermoregulation—

through the use of shelter, space heating, air conditioning, and clothing—enables humans to live in the most extreme climates in the world, but it does not provide fine control of body heat balance. In contrast, physiological thermoregulation is capable of fairly precise adjustments of heat balance but is effective only within a relatively narrow range of environmental temperatures.

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Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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