Tissue and Organs

                 Related cells joined together are collectively referred to as not identical, but they work together to accomplish specific functions. A sample of tissue removed for examination under a microscope (biopsy) contain's many type of cells, even though a doctor may be interested in only one specific type.

     Connective tissue is the tough, often fibrous tissue that binds the body's structures together and provides support. It is present in almost every organ,forming a large part of skin, tendon's and muscles. The characteristics of connective vary, depending on where its found in the body.

      The body's functions are conducted by organs. Each organ is recognizable stucture that performs specific functions for example the heart, lungs, liver, eyes and stomach. An organ is made of several type of tissue and therefore several types of cells. For example, the heart contains muscles tissue that contracts to pump blood, fibrous tissue and makes up the heat valves, and special cells that maintain the rate and rhythm of heartbeats.

      The eye contains muscle cells that open and close the pupil, clear that make up the lens and cornea, cells that produce the fluid within the eyes, cells that sense light, and nerve cells that conducts impulses to the brain. Even an organ as apparently simple as the gallbladder contains different types of cells, such those that from a lining resistant to the irritative effects to expel bile, and cells that contract to expel bile, and cells that from fibrous outer wall holding the sac together.