Solved UPSC CDS/OTA Question
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Q · Circulatory Systemmedium · 45s
Which mechanism helps venous return during inspiration?
TopicCirculatory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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During inspiration, thoracic cavity expansion lowers intrathoracic pressure, creating a suction effect that draws venous blood into the chest veins and right atrium, enhancing preload and cardiac output.
Final Answer: Option B - Decreased intrathoracic pressure