Water makes up over half of the human body and plays several critical roles. It acts as a solvent, transports nutrients and waste, cushions and protects organs and tissues, regulates body temperature, and lubricates joints. Dehydration, even as slight as 2% of body water loss, can negatively impact brain function, digestion, energy levels and lead to headaches and fatigue. Proper hydration is essential for overall health and well-being.

1. IMPORTANCE OF
WATER TO HUMAN
BEINGS

2. Figure 11.1
The Composition of the Body

3. © 2010 Pearson Education, Inc. Figure 11.5
Water Balance between Fluid Compartments
 Body fluid is located
• Intracellular
• Extracellular

4. © 2010 Pearson Education, Inc. Figure 11.2
Why Is Water So Important?
• Excellent
solvent in the
body
• Essential in
maintaining
acid-base
balance

5. Functions of Water in the BodyFunctions of Water in the Body
• Water lubricates jointsWater lubricates joints
and lets you moveand lets you move
freelyfreely
• Water maintainsWater maintains
elasticity and easyelasticity and easy
movement formovement for
connective tissue ofconnective tissue of
jointsjoints
• Water relives arthriticWater relives arthritic
painpain

6. Figure 11.3
Water Helps Regulate Body Temperature

7. Your digestive system andYour digestive system and
waterwater
• Food needs water toFood needs water to
properly digestproperly digest
• Hydration can reduce:Hydration can reduce:
heartburn, acidheartburn, acid
stomach, gas, andstomach, gas, and
constipationconstipation
• Dehydration canDehydration can
cause: weight gain,cause: weight gain,
poor muscle tone,poor muscle tone,
water retentionwater retention

8. Figure 11.6
Osmosis

9. Your brain and waterYour brain and water
• Brain 90% waterBrain 90% water
• When body is wellWhen body is well
hydrated one will noticehydrated one will notice
an increase clarity inan increase clarity in
thinkingthinking
• Less water decreasesLess water decreases
energy generation in theenergy generation in the
brainbrain
• Dehydration can result inDehydration can result in
headaches, depression,headaches, depression,
memory loss, chronicmemory loss, chronic
fatigue syndromesfatigue syndromes

10. Figure 11.9
DISADVANTAGES OF
HYDRATION:
• A mere 2% drop in our body's water supply can
trigger signs of dehydration.
• When the body gets too little water, it siphons
what it needs from within, particularly from the
colon. This leads to constipation
• The symptoms of dehydration can include:
- Headaches & feeling light headed,
- Fatigue
- Hunger & cravings
- Fluid retention

11. Conclusion
 Water is a means of transporting nutrients and
wastes, a physical cushion, a lubricant.
 When exhaled or perspired, water removes
excess heat energy from the body.
 Within the cell, it is the solvent in which all
chemical interactions occur.
 Adequate hydration is important for normal
health and for increased activity.