From Regina Bailey,
Your Guide to Biology.
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The human body is made up of several organ systems that work together as one unit.

The ten major organ systems of the body are listed below, along with several organs that are associated with each system.

Organ Systems

Circulatory:
• Cardiovascular: heart and blood
  
• Lymphatic: Lymphatic: Lymph nodes and vessels, thymus, spleen

Digestive:
• Primary organs: mouth, stomach, intestines, rectum
  
• Accessory organs: teeth, tongue, liver, pancreas

Endocrine:
• pituitary gland, pineal gland, ovaries, testes, thyroid gland

Integumentary:
• nails, hair, skin, sweat glands

Muscular:
• muscles

Nervous:
• brain, spinal cord, nerves

Reproductive:
• Male: testes, scrotum, penis, vas deferens, prostate
  
• Female: ovaries, uterus, vagina, mammary glands
  

Respiratory:
• lungs, nose, trachea, bronchi

Skeletal:
• bones and joints

Urinary/Excretory:
• kidneys, urinary bladder, urethra, ureters

It is important to keep in mind that these systems don't just exist as individual units. The final product of these cooperating systems is one unit called the body. Each system depends on the others, either directly or indirectly, to keep the body functioning normally.

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