Solved UPSC CDS/OTA Question
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Q · Respiratory System Medium · 45s
Which condition leads to cyanosis?
TopicRespiratory System
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Cyanosis is a bluish discoloration of the skin and mucous membranes caused by insufficient oxygen in the blood, particularly due to an increased amount of deoxygenated hemoglobin.
Low arterial O₂ (hypoxemia) means there is not enough oxygen in the blood, which can lead to cyanosis.
High arterial O₂ would prevent cyanosis.
Low arterial CO₂ and high blood pH (alkalosis) do not directly cause cyanosis, although they may occur in other respiratory or metabolic conditions.
So, low arterial O₂ is the condition that leads to cyanosis.
Final Answer: Option C - Low arterial O₂