Human organism is a complex set of interconnected organs, united in systems and functioning as a single whole. Organ – a separate group of tissues and cells that have a similar structure and shape, a stable position in the body and perform the same functions (one or more).
There are 10 main organ systems in the human body, which are presented in the table below (with a brief description).
| System name | Description |
| The set of bones of the skeleton, joints, muscles and other auxiliary organs that support the body and set it in motion. | |
| nervous | An interactive system consisting of the brain (brain and spinal cord) and nerves. Provides interconnected work of all internal organs, monitoring of the external and internal environment with a response to any changes. |
| An organ system made up of the heart and blood vessels. Provides blood circulation in the body, due to which the cells are saturated with oxygen, as well as the removal of carbon dioxide and waste products from them. | |
| respiratory | A set of organs (lungs and airways) that provide breathing, i.e. the intake of oxygen from the external environment into the body and the removal of carbon dioxide from it. The secondary functions of the system are smell, thermoregulation, making sounds, etc. |
| digestive | The system of organs with the help of which the digestion of food occurs, the saturation of the blood and lymph with the nutrients obtained, as well as the removal of waste products. Consists of the gastrointestinal tract and accessory organs. |
| A set of organs that contribute to the formation, accumulation and removal from the body of metabolic products, excess water, salts, etc. It consists of two kidneys, two ureters, a bladder and an urethra. | |
| Reproductive | A set of organs and systems that provide sexual reproduction, i.e. procreation. The sexual structure of men and women has a different structure. |
| Endocrine | A system that regulates processes in the body and the functioning of internal organs through secreted hormones. |
| Immune | The innate and acquired (adaptive) immune systems are distinguished. Provides protection of the body from viruses, toxic substances, malignant cells, etc. |
| Coating | A set of various tissues (skin, nails, hair, etc.) located on the surface of the human body, providing protection from the external environment: microorganisms, toxic substances, damage, overheating / hypothermia, etc. |