Phys Ch 1. Systems 1

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Phys Ch 1. Systems 1
2011-08-31 18:34:31

Systems: definition & function
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  1. integumentary system
    • forms external body covering
    • protects deeper tissue from injury
    • synthesizes vitamin D
    • location of cutaneous (pain, pressure etc.) receptors
    • location of sweat and oil glands
  2. skeletal system
    • protects and supports body organs
    • provides a framework the muscles use to cause movement
    • blood cells are formed within the bones
    • stores minerals
  3. muscular system
    • allows manipulation of the environment, locomotion, and facial expression
    • maintains posture
    • produces heat
  4. nervious system
    • fast-acting control system of the body
    • responds to interal and external changes by activating appropriate muscles and glands
  5. endocrine system
    glands secrete hormones that regulate processes such as growth, reproduction & nutrient use by body cells
  6. cardiovascular system
    • blood vessels transport blood
    • transports oxygen, CO2 , nutrients, wastes etc.
    • heart pumps blood
  7. lymphatic system
    • picks up fluid leaked from blood vessels and returns it to blood
    • disposes of debris in the lymphatic stream
    • houses whit blood cells involved in immunity
  8. respiratory system
    • keeps blood constantly supplied with oxygen and removes CO2
    • the gaseous exhanges occur through the walls of the air sacs of the lungs
  9. digestive system
    • breaks down food into absorbable units that enter the blood for distribution to body cells
    • indigestible foodstuffs are eliminated as feces
  10. urinary system
    • eliminates nitrogen containing wastes from the body
    • regulates water, electrolyte, and acid-base balance of the blood
  11. reproductive system
    • produces offspring
    • Testes produce sperm and testosterone; ducts and glands aid delivery of viable sperm to vagina
    • Ovaries produce egges and estrogen; sites for fertilization and development of the fetus
    • mammary glands produce milk to nourish newborn