Date: 11/02/2022 Shift: 9:00 AM – 10:00 AM Q. No: 41

Oxygen fuels our living processes. It contracts our muscles, helps our cells to work, grow and regenerate, (1)______ our brains, calms our nerves, helps the heart to pump, fights infection and (2)______ immunity,” says Dr Narendra Nath Jena, Director, Institute of Emergency Medicine, MMH R Centre, Madurai. Once air enters the nose or mouth, it gets humidified and reaches (3)______ alveoli. The alveoli are tiny air sacs that help to (4)______ oxygen and transfer it into the blood stream and also to pull out the carbon dioxide and push it out of the lungs. COVID-19 destroys (5)______ alveoli by thickening the walls so gas exchange becomes difficult.