Water, Water Everywhere

Water In the Human Body Is Everywhere, It  Makes Up 60% Of Us

Essential Functions of Water

  • Water moistens tissues in the body
  • Water regulates body temperature
  • Water lubricates our joints
  • Protects body organs and tissue, acts as a shock absorbent
  • Prevents constipation
  • Lessens the burden on the kidneys and liver by flushing waste
  • Helps to dissolve minerals making them more accessible
  • Carries nutrients and oxygen to the cells
  • The brain needs water both for protection, and to create hormones
  • Water is used to kill bacteria through cytolysis

Water averagely makes up 60% of the human body, but that can vary;

  • The average adult male contains 60%
  • The average adult female contains 55%
  • Babies contain around 75%
  • Older people 50%
  • People who have lower body fat percentages or are more muscular are more likely to contain more water in their muscles

Organs Contain High Percentages of Water

  • Lungs- the lungs are 83% water
  • Brain- the brain is 73% water, it needs water as a shock absorbent for protection
  • Heart- the heart contains 73% water
  • Muscles- the muscles are 79% water and need it for electrolyte stimulation (nerves)
  • Skin- the skin is 64% water, it needs water to keep from flaking and tightening


The average person should drink 8-12 cups a day;

  • That's 3 liters for men
  • 2.2 liters for women since they contain more water

Water's Specific Heat

Water's specific heat helps our body's cells and organs keep from getting too hot or cold, this helps things like enzymes keep at the temperature they work best at

Effects of  Dehydration

  • Dehydration is when the body hasn't gotten enough water to function properly
  • Symptoms: irritability, sleepy, inactive, skin doesn't "bounce back", dry mouth and other membranes, low blood pressure, dark urine in little or no amounts
  • People can survive 3-5 days with no water
  • The first systems to be affected would probably be the digestive system, skin, and eyes
  • Dehydration can become very dangerous if untreated, in the later stages the body begins to quit keeping fluids in, so it cannot get better

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