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People living at sea level have around 5...

People living at sea level have around 5 million RBC per cubic milimeter of their blood wheeas those living at an altitude of 5400 metres have around 8 million this is be cause at high atitude

A

People eat more nutritive food, therefore more RBC are formed

B

People get pollution free air to breathe and more oxygen is available

C

Atmospheric `O_2` level is less and more RBC are needed to absorb the required amount of `O_2` to survive

D

There is more UV radiation which enhances RBCs production

Text Solution

Verified by Experts

The correct Answer is:
C
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People living at sea level have around 5 million RBC per cubic millimetre of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude.

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In man , the number of R.B.C. per cubic mm of blood is (a) 1 to 3 millions (b) 5 to 5.4 millions (c) Less than one milliion but more than 50 thousand (d) Less than 50 thousand

Why do people living at higher altitudes have higher lung capacity and more red blood corpuscles?

Assertion : At higher peaks of mountains, people suffer from high altitude sickness (sluggish feeling, breathlessness etc.) due to lesser oxygen intake at each breather Reason : Air at sea level is dense because it is compressed by the mass of the air above it. The atmospheric pressure at higher peaks of mountains is lower causing the air at those heights to be much less dense than at sea level.