Organ System

• The integumentary system is the external covering of the body, or the skin, including the hair and fingernails.
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  Integumentary System

  It waterproofs the body and cushions and protects the deeper tissues from injury. With the help of sunlight, it produces vitamin D.
• Integumentary System

  • It also excretes salts in perspiration and helps regulate body temperature. Sensory receptors located in the skin alert us to what is happening at the body surface
• Skeletal System

  • It supports the body and provides a framework that the skeletal muscles use to cause movement. It also has protective functions (for example, the skull encloses and protects the brain), and the cavities of the skeleton are the sites where blood cells are formed.
• Skeletal System


  The hard substance of bones acts as a storehouse for minerals.
• Muscular System

  • The muscles of the body have only one function— to contract, or shorten. When this happens, movement occurs.
• Muscular System


  The mobility of the body as a whole reflects the activity of skeletal muscles, the large, fleshy muscles attached to bones.
• Nervous System

  • The sensory receptors detect changes in temperature, pressure, or light, and send messages (via electrical signals called nerve impulses) to the central nervous system (brain and spinal cord) so that it is constantly informed about what is going on.
• Endocrine System

  • The endocrine glands include the pituitary, thyroid, parathyroids, adrenals, thymus, pancreas, pineal, ovaries (in the female), and testes (in the male) .
• Cardiovascular System

  The primary organs of the cardiovascular system are the heart and blood vessels.
• Lymphatic System


  The role of the lymphatic system complements that of the cardiovascular system.
• Lymphatic System

  Its organs include lymphatic vessels, lymph nodes, and other lymphoid organs such as the spleen and tonsils.
• Lymphatic System

  
  

  • When fluid is leaked into tissues from the blood, lymphatic vessels return it to the bloodstream so that there is enough blood to continuously circulate through the body
• Digestive System

  • The organs of the digestive system include the oral cavity (mouth), esophagus, stomach, small and large intestines, and rectum plus a number of accessory organs (liver, salivary glands, pancreas, and others).
• Digestive System

  • Their role is to break down food and deliver the resulting nutrients to the blood for dispersal to body cells.
• Digestive System

  • The breakdown activities that begin in the mouth are completed in the small intestine. From that point on, the major function of the digestive system is to reabsorb water. The undigested food that remains in the tract leaves the body through the anus as feces
• Urinary System

  • A normal part of healthy body function is the production of waste by-products, which must be disposed of.
• Urinary System

  • One type of waste contains nitrogen (examples are urea and uric acid), which results when the body cells break down proteins and nucleic acids, which are genetic information molecules.