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.
However, for this purpose of this article, we are going to focus on one of the most common reactions to allergens, and that is hives. Hives, also known as urticaria, is an outbreak of swollen, pale red bumps or plaques (wheals) that suddenly appear on the skin. Their appearance is usually the result of either the bodyâs reaction to certain allergens. Hives, generally speaking, cause and itchy feeling, but may also burn or sting. Common areas for hives to appear include the face, tongue, lips, throat and ears. It is important to note that hives donât only come in one size, but rather they can carry from as small as a pencil eraser to as are as a hubcap.