List of systems of the human body

Part of a series of lists about
Human anatomy
General Features Regions Variations Movements Systems
Structures Arteries Bones Eponymous Foramina Glands endocrine Lymphatic vessels Nerves Organs Systems Veins
Muscles Abductors Adductors Depressors Elevators Extensors Flexors Rotators external internal
Glossary of medicine Glossary of medicine
See also Epithelia Anatomical terminology Index of anatomy articles Outline of anatomy Cell types by origin

The main systems of the human body are:

1. Circulatory system:
   • Circulates blood around the body via the heart, arteries and veins, delivering oxygen and nutrients to organs and cells and carrying their waste products away.
   • Keeps the body's temperature in a safe range.
2. Digestive system and Excretory system:
   • System to absorb nutrients and remove waste via the gastrointestinal tract, including the mouth, esophagus, stomach and intestines.
   • Eliminates waste from the body.
3. Endocrine system:
   • Influences the function of the body using hormones.
4. Integumentary system / Exocrine system:
   • Skin, hair, nails, sweat and other exocrine glands
5. Immune system and lymphatic system:
   • Defends the body against pathogens that may endanger the body.
   • The system comprising a network of lymphatic vessels that carry a clear fluid called lymph.
6. Muscular system:
   • Enables the body to move using muscles.
7. Nervous system:
   • Collects and processes information from the senses via nerves and the brain and tells the muscles to contract to cause physical actions.
8. Renal system and Urinary system
   • The system where the kidneys filter blood to produce urine, and get rid of waste.
9. Reproductive system:
   • The reproductive organs required for the production of offspring.
10. Respiratory system:
    • Brings air into and out of the lungs to absorb oxygen and remove carbon dioxide.
11. Skeletal system:
    • Bones maintain the structure of the body and its organs.

• Clockwise from top left: the integumentary
• skeletal
• nervous
• cardiovascular
• endocrine and muscular systems.

• Clockwise from top left: the lymphatic
• Respiratory system
• urinary reproductive (female
• male) and digestive systems.