An Independent Practice Association, or IPA, is an organization comprised of physicians who maintain their independent practices and also join together as an association. The IPA negotiates with organizations, like HMOs, which will supply both patients and income to physicians.
There are 11 major organ systems in the human body, which include the circulatory, respiratory, digestive, excretory, nervous and endocrine systems. The immune, integumentary, skeletal, muscle and reproductive systems are also part of the human body.
Human body has a number of cells and related tissues. Since the Cell is the basic unit of any tissue, it decides the type, nature and function of the tissues. A group of different types of cells form tissues in the human body and one or more types of tissues form organs. These body organs working in a mutual manner form the organ systems. If any tissue is damaged, it actually means the cells and cell structure in the organ is damaged.