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.
Homeostasis is the maintenance of a constant internal environment. Automatic control systems throughout the body maintain temperature and water at steady levels, which are required for cells to function properly. Strenuous exercise and survival in hot or cold climates affect homeostasis.