Question

Read the statements carefully and choose the option representing true statements.
(a) $p{O}_2$ in the atmospheric air does not change with altiude
(b) Most people who live at high altitude develop polycythemia due to hypoxia
(c) Excess inflation to the lungs is prevented by Hering-Breuer's reflex
(d) While transporting $C{O}_2$ in blood, blood does not become acidic due to presence of blood buffers.

• A. (a) & (c) only
• B. (b) & (c) only
• C. (a), (b) & (c) only
• D. (b), (c) & (d) only

Answer 1

The correct option is D (b), (c) & (d) only

$p{O}_2$ of atmospheric air decreases with increasing altitude.

Most people living at high altitude develop polycythemia due to hypoxia as oxygen levels are low.

Hering Breuer's reflex prevent excessive inflation of lungs .

Blood has an efficient buffer system which resists the change in pH even after dissolution of carbon dioxide.

So the correct answer is '(b), (c) & (d) only '.