WATER : LIFE’S MAIN SOURCE
Man does not live by food alone. Water is vital to human health and fitness. Although it is not a nutrient per se as are carbohydrates, fats, proteins, vitains and minerals. It, in fact, is a key nutrient in as much as no life is possible without it. Whereas we can do for weeks without food, we cannot live without water longer than a couple of days. Water approximates 60 per cent of the body weight of human adults. The total amount of water in a man weighing 70 kilograms is approximately a little over 40 litres. It is an excellent solvent – more substances are soluble in water than in any other liquid known so far. This makes it an ideal constituent of the body fluids which sustain life supporting chemical reactions. It dissolves varied products of digestion and transports them to the rest of the body. Likewise, it dissolves diverse metabolic wastes and helps drain them out of the body. Besides, it performs a variety of functions – some well-known and well understood while others not so well appreciated yet vital. The no less important role of water is to distribute/dissipate the body heat efficiently, thereby regulating the body’s temperature. Water accomplishes this role ideally because it has thermal conductivity ensuring rapid heat from one part to the other. Above all, water has a high-specific heat, implying that it takes a lot of heat to raise the temperature of water and likewise much heat must be lost to lower its temperature. Drinking a lot of water is an inexpensive way to stay healthy. Even excess of water is harmless. Water therapy-drinking a litre or so the first thing in the morning is kidney-friendly. The water regulation in the body is affected by hypothalamus in two ways i.e. (i) by creating the sensation of thirst which makes us drink water and (ii) by controlling the excretion of water and urine. If water regulation fails, medical emergency ensues.
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Man cannot live for more than a couple of days –
Water is an excellent solvent because………….
It regulates excretion of urine
It dissolves metabolic wastes
It drains waste out of body
More substances are soluble in it than in any other liquid
The high thermal conductivity of water helps to……..
dissolve metabolic wastes
regulates body temperature
sustain life supporting chemical reactions
The total amount of water in a man weighing 70 kg is………..
Approx 70 litres
Approx 60 litres
Approx 40 litres
Approx 50 litres
High specific heat of water means……….
It has high thermal conductivity
It takes less heat to raise its temperature
It takes more heat to raise its temperature
It distributes the body heat efficiently
Drinking a litre of water in the morning is called……….
What is vital to human health ?
What is an inexpensive way to stay healthy ?
eat lots of food
drink fruit juices
drink a lot of water
eat lots of fruits
What does solvent mean ?
able to dissolve
able to drink
able to think
able to solve
When does medical emergency ensue ?
water temperature rises
water regulation fails
water chemical rises
all is well
What is another thing needed by man for survival other than water ?
What percentage of body weight of adult is water ?
The antonym of “excellent”
The synonym of ideal
Find the correct statement
Excess of water is harmful
Water is not kidney friendly
Water distributes the body heat efficiently
Water is not important in life
Write the antonym of ‘little’
In how many ways hypothalamus affects our body?
What does water dissolve in our human body?
Who has high specific heat?
What is not so well appreciated yet is vital in life?