List of systems of the human body

This is a list of the main organ systems in the human body.

Circulatory system/cardiovascular 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, as well as keeping the body's temperature in a safe range.

Digestive system/excretory system
System to absorb nutrients and remove waste via the gastrointestinal tract, including the mouth, oesophagus, stomach and intestines.

Endocrine system
Influences the function of the body using hormones.

Exocrine system
System that secrete substances through ducts for various functions.

Integumentary system
The integumentary      system comprises skin and its appendages; hair, nails, sweat glands and oil glands.

Immune system/lymphatic system
Defends the body against pathogens that may harm the body. The system contains a network of lymphatic vessels that carry a clear fluid called lymph.

Muscular system
Enables the body to move using muscles.

Nervous system
Collects and processes information from the senses via nerves and the brain and tells the muscles to contract to cause physical actions.

Reproductive system
The reproductive organs are required for the production of offspring.

Respiratory system
Brings air into and out of the lungs to absorb oxygen and remove carbon dioxide.

Skeletal system
Bones maintain the structure of the body and its organs.

Urinary system/renal system
The urinary system (also known as renal system) filter blood with the help of kidneys to produce urine, and get rid of waste.