Busy at Work - our Internal Organs - Standard 5 - Environmental Studies - Part 1 - Balbharati

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 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.

Ans. 1. Move the person to a safe place if needed.

2. Tap and speak loudly. If no response, shout for help. Call emergency services.

3. Look, listen, and feel for breathing.

4. Loosen tight clothing around the neck, chest, and waist.

5. Stay calm and comfort the person. Keep the crowd at a distance.

Q. 2 Use your brain power!

(a) Why do we sometimes choke suddenly while eating?

Ans. Sometimes, when we eat too fast or don't chew our food enough, it can get stuck in our throat. The epiglottis which is like a flap that normally protects our windpipe, might not do its job. Then food goes into the wrong place and causes us to suddenly choke.

(b) How is the air that we inhale purified in our body?

Ans. When we breathe in, hairs in our nose trap dust and tiny particles. Then, the air travels through the windpipe and into the lungs. Inside the lungs, there are tiny hair-like parts called cilia that move together to push out any remaining particles. It keeps our airways clean.

Q. 3 Fill in the blanks.

(a) Oxygen gas is transported to all parts of the body.

(b) The stomach is like a bag.

Q. 4 Match the following.

Group A Answers
Lungs Respiration
Stomach Digestion
Heart Circulation
Brain Co-ordination

Q. 5 Answer the following questions

(a) Name the systems that carry out the different functions of the body.

Ans. 1. Digestive system

2. Respiratory system

3. Circulatory system

4. Nervous system

(b) Describe how the exchange of oxygen 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 flows 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 enters the air in the alveoli. When we exhale, the carbon dioxide is also given out with the air.

(c) Why do we call saliva a digestive juice?

Ans. Saliva is called a digestive juice because it contains special substances called enzymes that help break down food. These enzymes break down starches into simpler sugars. Saliva also moistens food, makes it easier to swallow and helps in the digestion process.

Q. 6 Choose the appropriate word from the brackets.

(circulation, trachea, diaphragm)

a. Respiration takes place because of its up and down movement.

Ans. diaphragm.

b. The process of keeping the blood flowing continuously throughout the body.

Ans. circulation.

c. Air that enters through the nose passes into this tube.

Ans. trachea.

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