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 stick to this substance. Thus, the harmful substances in the air cannot reach the lungs. Hence it get purified in our body.
Q.3 Fill in the blanks.
1. .......... gas is transported to all parts of the body.
Ans: Oxygen is transported to all parts of the body.
2. The stomach is like a ..........
Ans: The stomach is like a bag.
Q.4. Match the following .
Group A Group B
1. Lungs a. Circulation
2. Stomach b. Respiration
3. Heart c. Co-ordination
4. Brain d. Digestion
Ans:
Group A Group B
1. Lungs b. Respiration
2. Stomach d. Digestion
3. Heart a. Circulation
4. Brain c. Circulation
Q.5. Answer the following questions.
1. Name the systems that carry out the different functions of the body.
Ans: Respiratory system, digestive system, circulatory system, nervous system, skeletal system and excretory system are the systems that carry out the different functions of the body.
2. Describe how the exchange of oxgen and carbon dioxide gases takes place in the lungs.
Ans: 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 parts of the body. At the same time,the carbon dioxide that is brought by the blood from all parts of the body entera the air in thw alveoli. When we exhale,thw carbon dioxide is also given out with the air.
In thia way, an exchange of oxygen and carbon dioxide gases takes place in the alveoli.
3. Why do we call saliva a digestive juice?
Ans: Saliva is a juice secreted by the salivary glands. Saliva helps to make bolus from food that we eat. Saliva also contains the starch digesting enzyme.This enzyme turns starch in to sugar. There fore it is called a digestive juice.
Q. 6. Choose the appropriate word from the brackets.( circulation, trachea, diaphragm)
1. Respiration takes place because of it up and down movement.
Ans: diaphragm
2. The process of keeping the blood flowing continuously throughout the body.
Ans: Circulation
3. Air that entera through the nose passes into this tube.
Ans: Trachea
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 stick to this substance. Thus, the harmful substances in the air cannot reach the lungs. Hence it get purified in our body.
Q.3 Fill in the blanks.
1. .......... gas is transported to all parts of the body.
Ans: Oxygen is transported to all parts of the body.
2. The stomach is like a ..........
Ans: The stomach is like a bag.
Q.4. Match the following .
Group A Group B
1. Lungs a. Circulation
2. Stomach b. Respiration
3. Heart c. Co-ordination
4. Brain d. Digestion
Ans:
Group A Group B
1. Lungs b. Respiration
2. Stomach d. Digestion
3. Heart a. Circulation
4. Brain c. Circulation
Q.5. Answer the following questions.
1. Name the systems that carry out the different functions of the body.
Ans: Respiratory system, digestive system, circulatory system, nervous system, skeletal system and excretory system are the systems that carry out the different functions of the body.
2. Describe how the exchange of oxgen and carbon dioxide gases takes place in the lungs.
Ans: 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 parts of the body. At the same time,the carbon dioxide that is brought by the blood from all parts of the body entera the air in thw alveoli. When we exhale,thw carbon dioxide is also given out with the air.
In thia way, an exchange of oxygen and carbon dioxide gases takes place in the alveoli.
3. Why do we call saliva a digestive juice?
Ans: Saliva is a juice secreted by the salivary glands. Saliva helps to make bolus from food that we eat. Saliva also contains the starch digesting enzyme.This enzyme turns starch in to sugar. There fore it is called a digestive juice.
Q. 6. Choose the appropriate word from the brackets.( circulation, trachea, diaphragm)
1. Respiration takes place because of it up and down movement.
Ans: diaphragm
2. The process of keeping the blood flowing continuously throughout the body.
Ans: Circulation
3. Air that entera through the nose passes into this tube.
Ans: Trachea
Too long sir :(
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