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The human body is a complex biological system involving cells, tissues, organs, and systems all working together to make up a human being. From the outside, the human body can be divided into several main structures. The head houses the brain which controls the body. The neck and trunk house many important structures related to respiration and digestion. The arms and legs control many of the physical interactions between the body and the outside world.

Cells[edit | edit source]

The body contains trillions of cells, the fundamental unit of life. At maturity, there are roughly 30–37 trillion cells in the body, an estimate arrived at by totaling the cell numbers of all the organs of the body and cell types. The body is also host to about the same number of non-human cells as well as multicellular organisms which reside in the gastrointestinal tract and on the skin.

Tissues and Organs[edit | edit source]

An organ is a group of tissues that constitute a distinct structure or set of structures in the body. Organs are assembled from the four primary tissues and are involved in primary functions necessary for life. Examples of organs include the heart, lungs, liver, brain, and stomach.

Diseases and Disorders[edit | edit source]

There are many types of diseases and disorders that can affect the human body. Some of these include genetic disorders, infectious diseases, and lifestyle diseases such as heart disease and diabetes. Treatment for these diseases can involve medication, surgery, and lifestyle changes.

Medicine and Healthcare[edit | edit source]

Medicine is the science and practice of establishing the diagnosis, prognosis, treatment, and prevention of disease. Healthcare is delivered by health professionals and allied health fields. Physicians and physician associates are a part of these health professionals.