= Physiological effector
A <physiological effector> performs the action that changes the <regulated physiological variable>. In <thermoregulation>, <sweat glands>, changes in <skin> blood flow, and <skeletal muscle> <shivering> contribute different actions. The command, the action and the resulting <temperature> are three distinct readouts. <Anatomy and Physiology 2e by J. Gordon Betts and others/1.5 Homeostasis>[§1.5, Figure 1.10 and thermoregulatory examples following it]{ref}
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