By Regina Bailey. Definition: Homeostasis is the ability to maintain a constant internal environment in response to environmental changes. It is a unifying principle of biology. The nervous and endocrine systems control homeostasis in the body through feedback mechanisms involving various organs and organ systems.
Urticaria is the medical term for a type of allergic rash. Hives are the most common type of urticaria. Hives are itchy, pink to light red, raised blotches that are usually one-quarter to one-half inch in size.Hives can occur on any part of the body.ives are the most common type of urticaria. Hives are itchy, pink to light red, raised blotches that are usually one-quarter to one-half inch in size. Hives can occur on any part of the body.
Hives, also known as urticaria, are red welts that appear on the skin and are typically caused by an allergic reaction to foods or medication.They may appear like a normal skin rash that is slightly raised, forming in large patches.ives, also known as urticaria, are red welts that appear on the skin and are typically caused by an allergic reaction to foods or medication.