21. Busy at work - our internal organs
exercise
Q.1 what's the solution ?
A person has fainted and a crowd of people has surrounded him.
Answer :- when a person fainted he should be immediately given clean and fresh air. therefore, ask the crowd to move away. then splash cold water on the face of this man. if he is not reviving, take him immediately to the doctor with the help of other.
Q.2 use your brain power !
A) why do we sometimes choke suddenly while eating ?
Answer :- the upper ends of the boat of oesophagus and the trachea open in the throat next to each other. there is a flap that Cover the trachea. when the food is swallowed, the remains closed. but if we eat in a hurry, the food enter in trachea. this causes choking. but due to coordination of brain, we immediately start coughing and the food particles are explled out of the trachea.
B) how each year that we inhale purified in our body ?
Answer :- there are tiny, fine hair-like outgrowths called cilia inside the nose from where the air passes inside. largest dust particles get caught in these hairs. the air going inside the trachea thus gets filtered. there is also a layer of a sticker substance called mucous. the dust and smoke particles sticks to the moucous. the the air that we inhale gets purified before it reaches the lungs
Q.3 fill in the blanks.
A) __________Gas is transported to all parts of body.
Answer :- oxygen
B) the stomach is a like a __________
Answer :- bag
Q.4 match the following.
Group 'A'. Group 'B'.
Question Answers
1) Lungs. Respiration.
2) Stomach. Digestion.
3) Heart. Circulation.
4) brain. Coordination.
Q.5 answer the following question.
A) Name the systems that carry out the different function in the body.
Answer :- respiratory system, digestive system, circulatory system, Nervous System, skeletal system and excretory system are some of the systems that carry out different functions of the body.
B) describe how the exchange of Oxygen and Carbon dioxide gases take places in the lungs.
answer :- at the time of respiration a extranal air that reaches up to the alveoli in the lungs. the oxygen in the air enters the blood vessels which surround the alveoli. through the network of blood vessels oxygen is supplied to the entire body. at the same time carbon dioxide brought by the circulating into the alveoli. from here carbon dioxide is given out of the body through inhalation in this exchange of Oxygen and Carbon dioxide gases take place in in the lungs of the lungs.
C) why we call saliva is digestive juice ?
answer :- saliva is the juice secreted by the salivary glands. saliva helps to make bolus from the food that we eat. Saliva also contains a start digestive enzyme this enzyme turns starch into sugar. therefore Saliva is called the digestive juice.
Q.6 choose the appropriate word from the brackets.
(circulation, trechea ,diagram)
A) respiration take place because of its up and down.
Answer :- Diaphragm
B) movement the process of keeping the blood flowing continuously throughout the body.
Answer :- circulation
C) Air that through the north passes into this tube.
Answer :- trachea
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