Why do human beings face difficulty breathing | vedclass

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(D) At high altitudes,the total atmospheric pressure is lower than at sea level. Because the total atmospheric pressure is lower,the partial pressure

Vedclass · Accepted Answer

Low partial pressure of $O_{2}$

Vedclass · Answer

(D) At high altitudes,the total atmospheric pressure is lower than at sea level. Because the total atmospheric pressure is lower,the partial pressure of oxygen $(pO_{2})$ is also significantly lower. Breathing involves the diffusion of oxygen from the atmosphere into the blood,which depends on the pressure gradient. Since the partial pressure of oxygen in the atmosphere is low at high elevations,the diffusion of oxygen into the blood becomes difficult,leading to breathing difficulties.

	Stomata of Monocots	Stomata of Dicots
$A$.	Bean-shaped	Dumbbell-shaped
$B$.	Dumbbell-shaped	Bean-shaped
$C$.	Bean-shaped	Bean-shaped
$D$.	Dumbbell-shaped	Dumbbell-shaped

Column-$I$	Column-$II$ (Amount of $CO_2$ in $mm \ Hg$)
$(a)$ Alveoli	$(1)$ $40$
$(b)$ Tissue	$(2)$ $45$
$(c)$ Blood without $O_2$ (Deoxygenated)	$(3)$ $40$
$(d)$ Blood with $O_2$ (Oxygenated)	$(4)$ $45$

Why do human beings face difficulty breathing at high elevations?

Similar Questions

Select the correct option for the shape of guard cells in stomata.
Stomata of Monocots Stomata of Dicots
$A$. Bean-shaped Dumbbell-shaped
$B$. Dumbbell-shaped Bean-shaped
$C$. Bean-shaped Bean-shaped
$D$. Dumbbell-shaped Dumbbell-shaped

Exchange of gases in man takes place at the level of

Partial pressure of a gas is the pressure contributed by

Arrange the appropriate pair.
Column-$I$ Column-$II$ (Amount of $CO_2$ in $mm \ Hg$)
$(a)$ Alveoli $(1)$ $40$
$(b)$ Tissue $(2)$ $45$
$(c)$ Blood without $O_2$ (Deoxygenated) $(3)$ $40$
$(d)$ Blood with $O_2$ (Oxygenated) $(4)$ $45$

What is the value of $pO_2$ in alveoli and tissues respectively?

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