Pulmonary hypertension is a rare lung disorder in which the arteries that carry blood from the heart to the lungs become narrowed, making it difficult for blood to flow through the vessels. As a result, the blood pressure in these arteries -- called pulmonary arteries -- rises far above normal levels.
Homeostatic Control Mechanisms Homeostatic Control Mechanisms are devices for maintaining or restoring homeostasis. They involve virtually all of the bodyâs organs and systems.
In this case, temperature is being regulated by a control system, and the control is called homeostasis. Engineers refer to the first kind of action, a simple response to a stimulus, as an open loop system. It is useful to draw a diagram of how such a system works. Such a diagram is shown in Fig. 2-1. The system being controlled is contained within the box marked controlled system..