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Water

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by

Luli Giambruni

on 14 April 2017

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Transcript of Water


Opposing charges are attracted to each other
Composition
Cohesion
Sticking of water molecules together (due to hydrogen bonds)
Some functions
-Transport of substances in plasma
-Enzymes and nutrients dissolve in it in the alimentary canal
-Helps get rid of waste products through urea
-Is a raw material in photosynthesis
-Helps with temperature control: carries away heat energy when it evaporates from the surface (cooler surface)
-Excellent solvent for ions and polar molecules
-Nourishes the brain and spinal cord
-Contains oxygen which reaches all cells and allows them to respire
Some facts
-60% of our bodies is made up of water
-An adult's brain and heart is made up of 3/4 of water
-Each day we lose 2-3 liters of water
-We should drink between 2-3 liters of water per day (depending on our health, sex, age, the activity we do and if we are overheated)
-Water within food makes up 1/5 of our daily water intake (ex: strawberries are made up 90% of water)
-Optimal hydration can lower chances of strokes, help manage diabetes and reduce the risk of some cancers
Ways of losing water:
-peeing
-sweating
-breathing
Drinking the right amount of water will affect how we
feel
,
think
and
function
every day.
Water
+
+
-
H20
The 2 hydrogen molecules are positively charged, whereas the oxygen molecules has negative charge.
The 3 molecules are joined together by a Covalent Bond.
Therefore, the negatively charged oxygen atoms attract the positively charged hydrogen atoms.
Hydrogen Bond
This generates a great water tension (which allows some organisms to walk over the water surface)
Dehydration ≠ Overhydration
maintaining balanced water levels to prevent:
excess of water amount in the body caused by overconsumption in a short period of time
lack of water concentration in the body
Detection of low water levels
-Sensory receptors in the brain's hypothalamus causes antidiuretic hormone to be released
-When the signal of the hypothalamus reaches the kidneys, it creates aquaporins (special channels that enable blood to absorb or retain more water) leading to concentrated dark urine
Symptoms of dehydration:
-notable decrease in energy
-changes in mood
-skin moisture
-decrease in blood pressure
-cognitive impairment (mental damage)
Full transcript