The 12 Organ Systems

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The 12 Organ Systems
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I. Integumentary System

• A. Function
• 1. External body covering
• 2. Protects tissues from injury
• 3. Synthesizes vitamin D
• B. Includes
• 1. Cutaneous receptors (pain, temperature and
  pressure)
• 2. Hair, skin nails

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Integumentary System
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II. Skeletal System

• A. Function
• 1. Protects and supports body organs
• 2. Framework for muscles to work
• 3. Produces blood cells
• B. Includes
• 1. Cartilage
• 2. Bones
• 3. Joints

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Skeletal System
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III. Muscular System

• A. Function
• 1. Allows for movement
• 2. Internal movement
• 3. Facial expression
• B. Includes
• 1. Skeletal muscles
• 2. Organ muscles

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Muscular System
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IV. Lymphatic System

• A. Function
• 1. Houses white blood cells (immune)
• 2. Picks up leaks from blood vessels
• 3. Disposes of debris in lymph system
• B. Includes
• 1. Lymph nodes
• 2. Lymphatic vessels
• 3. Thoracic duct

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Lymphatic System
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V. Immune System

• A. Function
• 1. Attacks foreign substances with antibodies
• 2. Protects body
• B. Includes
• 1. Red bone marrow
• 2. Spleen
• 3. Thymus
• 4. Lymphocytes

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Immune System
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VI. Respiratory System

• A. Function
• 1. Keeps blood supplied with oxygen
• 2. Removes carbon dioxide (gas change)
• B. Includes
• 1. Nasal cavity 2. Pharynx
• 3. Larynx 4. Trachea
• 5. Bronchus 6. Lungs

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Respiratory System
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VII. Nervous System

• A. Function
• 1. Respond to stimuli (internal/external)
• 2. Fast acting control system
• B. Includes
• 1. Brain
• 2. Sensory receptors
• 3. Spinal cord
• 4. nerves

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Nervous System
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VIII. Endocrine System

• A. Function
• 1. Secrete hormones
• 2. Regulate homeostasis
• B. Includes
• 1. Pineal gland 5. Adrenal gland
• 2. Pituitary gland 6. Pancreas
• 3. Thyroid gland 7. Testis/ovary
• 4. Thymus gland

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Endocrine System
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IX. Cardiovascular System

• A. Function
• 1. Pumps blood
• 2. Transport O2 and CO2
• B. Includes
• 1. Heart
• 2. Blood vessels

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Cardiovascular System
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X. Digestive System

• A. Function
• 1. Breaks down food
• 2. Eliminates indigestible food (feces)
• B. Includes
• 1. Oral cavity 5. Large intestine
• 2. Esophagus 6. Rectum
• 3. Stomach 7. Anus
• 4. Small intestine

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Digestive System
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XI. Urinary System

• A. Function
• 1. Regulates water, electrolyte and blood
  balance of acid/base
• 2. Eliminates wastes
• B. Includes
• 1. Kidney
• 2. Ureter
• 3. Urinary bladder
• 4. Urethra

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Urinary System
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XII. Reproductive System

• A. Function
• 1. Production of offspring
• 2. Release sex hormones (estrogen/testosteron
  e)
• B. Includes
• 1. Lots of stuff we will get to later
• 2. Ovaries/testis

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Reproductive System
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