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.
4. Every square inch of the human body has about 19 million skin cells. 5. Every hour about 1 billion cells in the human body must be replaced. 6. The average human head has about 100,000 hairs. 7. The circulatory system of arteries, veins, and capillaries is about 60,000 miles long. 8.