Solved UPSC CDS/OTA Question
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Q · Respiratory System medium · 45s
Which nerve carries the signal for diaphragm contraction?
TopicRespiratory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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The phrenic nerves (C₃–C₅) innervate the diaphragm. Stimulation causes contraction and flattening. Injury to these nerves results in respiratory compromise or diaphragmatic paralysis.
Final Answer: Option B - Phrenic nerve