Class 5: EVS 1: 21. Busy at work - our Internal OrgansEXERCISE (page no. 114)
21. Busy at work - our Internal Organs EXERCISE (page no. 114) 1. What's the solution? A person has fainted and a crowd of people has surrounded him. Ans: If a person has fainted then ask the crowd of people to move away form the fainted person as he will be requiring fresh and enough air. Flash some water on his face if he doesn't revivie then take him safly to doctor. 2. Use your brain power! A. Why do we sometimes choke suddenly while eating? Ans: The upper ends of the both oesophagus and the windpipe open in the throat next to each other. When food is swallowed, the wind pipe remains closed.But, when we eat hurry,the food may enter the windpipe and cause us to chokebon it. That is why we must not eat in a hurry. B. How is the air that we inhale purified in our body? Ans: The inner lining of the respiratory organs has fine hairlike structures calles cilia.On this inner lining, there is also a layer of a sticky substance called mucous. The dust and smoke particles s...