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 beings are complex organisms because they have many different types of cells which are organized into tissues, organs and systems to ensure that the body functions efficiently and smoothly. The organisation in the human body is summarized as: There are approximately 200 types of cells in the human body.