At sea level,the blood of individuals contains approximately $5$ million red blood cells per cubic millimeter. However,individuals living at an altitude of $5400$ meters have $8$ million red blood cells per cubic millimeter. Why does this increase occur?
- ADue to low atmospheric $O_2$ levels,more red blood cells are required to obtain the necessary $O_2$ for survival.
- BThere is more ultraviolet radiation,which stimulates the production of red blood cells.
- CPeople consume more nutrients,which leads to the production of more red blood cells.
- DPeople breathe pollution-free air,which allows for more oxygen intake.
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Similar Questions
Which two of the following changes $(i-iv)$ usually tend to occur in plain dwellers when they move to high altitudes ($3,500 \ m$ or more)?
$(i)$ Increase in red blood cell size
$(ii)$ Increase in red blood cell production
$(iii)$ Increased breathing rate
$(iv)$ Increase in thrombocyte count
Changes occurring are
$(i)$ Increase in red blood cell size
$(ii)$ Increase in red blood cell production
$(iii)$ Increased breathing rate
$(iv)$ Increase in thrombocyte count
Changes occurring are
MediumAIPMT 2010
View SolutionIn humans, respiration occurs in the following steps. Arrange these steps in the correct order.
$A$. Diffusion of $O_2$ and $CO_2$ between blood and tissues
$B$. Diffusion of $O_2$ and $CO_2$ across alveolar membrane
$C$. Pulmonary ventilation by which atmospheric air is drawn in and $CO_2$ rich alveolar air is released out
$D$. Cellular respiration
$E$. Transport of gases by the blood
$A$. Diffusion of $O_2$ and $CO_2$ between blood and tissues
$B$. Diffusion of $O_2$ and $CO_2$ across alveolar membrane
$C$. Pulmonary ventilation by which atmospheric air is drawn in and $CO_2$ rich alveolar air is released out
$D$. Cellular respiration
$E$. Transport of gases by the blood
MediumNEET 2026
View SolutionRespiration is the physiological process in which
Medium
View SolutionWhat is the respiratory rate in a rabbit?
Easy
View SolutionMatch the partial pressure of carbon dioxide in different parts involved in diffusion in comparison to the atmosphere.
Column-$I$ Column-$II$ ($mm\, Hg$ pressure) $P$. Atmospheric air $I$. $40$ $Q$. Tissues $II$. $45$ $R$. Oxygenated blood $III$. $0.3$
| Column-$I$ | Column-$II$ ($mm\, Hg$ pressure) |
| $P$. Atmospheric air | $I$. $40$ |
| $Q$. Tissues | $II$. $45$ |
| $R$. Oxygenated blood | $III$. $0.3$ |
Medium
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