Maharashtra Board Class 5 EVS Solution Chapter 21 – Busy at Work – Our Internal Organs
Balbharati Maharashtra Board Class 5 EVS Solution Chapter 21: Busy at Work – Our Internal Organs. Marathi or English Medium Students of Class 5 get here Busy at Work – Our Internal Organs full Exercise Solution.
|Maharashtra Class 5|
Environmental Studies Solution
Busy at Work – Our Internal Organs
At first the crowd of people should be removed for sufficient requirement of oxygen. The person must be laid down on his or her back and the feet must be elevated higher than the head to keep adequate blood flow to the brain, which will prevent fainting.
(a) When we eat in a hungry, the food may enter the windpipe which cause us to choke. Speaking while eating is also cause us to choke.
(b) The inner lining of the respiratory organs has fine hairlike structures called cilia. On this inner lining, there is also a layer of a sticky substance called mucous. The dust and smoke particles of air struck to this substance and thus the lungs and the air that we inhale purified in our body.
(Q3) Fill in the blanks
(Q5) Answer the following question
(a) Respiratory system, digestive system, circulatory system and nervous system are the systems that carry out the different functions of the body.
(b) When the outside air reaches the alveoli, the oxygen in it passes into the thin blood vessels around the alveoli. With the blood, it is carried to all body parts. At the same time, carbon dioxide that is brought by the blood from all parts of the body enters the air in the alveoli. When we exhale, the carbon dioxide is also given out with the air. In this way the exchange of oxygen and carbon dioxide gases takes place in the lungs.
(c) Saliva helps to convert food into a soft moist ball called a bolus which is easy to swallow. The bolus passes through the oesophagus into the stomach. That is why Saliva is called a digestive juice.