List of systems of the human body

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 sex 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.

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• 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.

See also

• List of distinct cell types in the adult human body
• List of organs of the human body
• Organ systems