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.
The human body contains more than 200 joints -- sites where 2 or more bones come together. Joints not only allow for movement but can also provide stability. The human body has 3 different types of joints, based on their structure: fibrous, cartilaginous and synovial.