(b) Asthma is a disease caused due to an allergic reaction to foreign substances that affect the respiratory tract. In this, the airways and lungs of a person can become obstructed because they become narrow and cut off air flow. Bronchioles can constrict (narrow) because of muscle spasms.
NCERT (Page-275 / N-190
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Emphysema developes mainly because of
1 allergy or hypersensitization.
2 spasm of the smooth muscles of bronchioles.
3 cigarette smoking.
4 inflammation of the alveoli
Explanation:
(c) Emphysema developes mainly because of cigarette smoking.
NCERT ( Page-275 / N-190
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278144
Which one of the following is the correct statement for respiration in humans?
1 Workers in grinding and stone-breaking industries may suffer from lung fibrosis.
2 About$90\text{ }\!\!%\!\!\text{ }$ of carbon dioxide $\left( \text{C}{{\text{O}}_{2}} \right)$ is carried by haemoglobin as carbaminohaemoglobin.
3 Cigarette smoking may lead to inflammation of bronchi.
4 Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration.
Explanation:
(a)
NCERT ( Page-276 / N-191
BREATHING and EXCHANGE OF GASES
278146
Chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. One of the major
causes of this is cigarette smoking.
(b) Asthma is a disease caused due to an allergic reaction to foreign substances that affect the respiratory tract. In this, the airways and lungs of a person can become obstructed because they become narrow and cut off air flow. Bronchioles can constrict (narrow) because of muscle spasms.
NCERT (Page-275 / N-190
BREATHING and EXCHANGE OF GASES
278143
Emphysema developes mainly because of
1 allergy or hypersensitization.
2 spasm of the smooth muscles of bronchioles.
3 cigarette smoking.
4 inflammation of the alveoli
Explanation:
(c) Emphysema developes mainly because of cigarette smoking.
NCERT ( Page-275 / N-190
BREATHING and EXCHANGE OF GASES
278144
Which one of the following is the correct statement for respiration in humans?
1 Workers in grinding and stone-breaking industries may suffer from lung fibrosis.
2 About$90\text{ }\!\!%\!\!\text{ }$ of carbon dioxide $\left( \text{C}{{\text{O}}_{2}} \right)$ is carried by haemoglobin as carbaminohaemoglobin.
3 Cigarette smoking may lead to inflammation of bronchi.
4 Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration.
Explanation:
(a)
NCERT ( Page-276 / N-191
BREATHING and EXCHANGE OF GASES
278146
Chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. One of the major
causes of this is cigarette smoking.
(b) Asthma is a disease caused due to an allergic reaction to foreign substances that affect the respiratory tract. In this, the airways and lungs of a person can become obstructed because they become narrow and cut off air flow. Bronchioles can constrict (narrow) because of muscle spasms.
NCERT (Page-275 / N-190
BREATHING and EXCHANGE OF GASES
278143
Emphysema developes mainly because of
1 allergy or hypersensitization.
2 spasm of the smooth muscles of bronchioles.
3 cigarette smoking.
4 inflammation of the alveoli
Explanation:
(c) Emphysema developes mainly because of cigarette smoking.
NCERT ( Page-275 / N-190
BREATHING and EXCHANGE OF GASES
278144
Which one of the following is the correct statement for respiration in humans?
1 Workers in grinding and stone-breaking industries may suffer from lung fibrosis.
2 About$90\text{ }\!\!%\!\!\text{ }$ of carbon dioxide $\left( \text{C}{{\text{O}}_{2}} \right)$ is carried by haemoglobin as carbaminohaemoglobin.
3 Cigarette smoking may lead to inflammation of bronchi.
4 Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration.
Explanation:
(a)
NCERT ( Page-276 / N-191
BREATHING and EXCHANGE OF GASES
278146
Chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. One of the major
causes of this is cigarette smoking.
(b) Asthma is a disease caused due to an allergic reaction to foreign substances that affect the respiratory tract. In this, the airways and lungs of a person can become obstructed because they become narrow and cut off air flow. Bronchioles can constrict (narrow) because of muscle spasms.
NCERT (Page-275 / N-190
BREATHING and EXCHANGE OF GASES
278143
Emphysema developes mainly because of
1 allergy or hypersensitization.
2 spasm of the smooth muscles of bronchioles.
3 cigarette smoking.
4 inflammation of the alveoli
Explanation:
(c) Emphysema developes mainly because of cigarette smoking.
NCERT ( Page-275 / N-190
BREATHING and EXCHANGE OF GASES
278144
Which one of the following is the correct statement for respiration in humans?
1 Workers in grinding and stone-breaking industries may suffer from lung fibrosis.
2 About$90\text{ }\!\!%\!\!\text{ }$ of carbon dioxide $\left( \text{C}{{\text{O}}_{2}} \right)$ is carried by haemoglobin as carbaminohaemoglobin.
3 Cigarette smoking may lead to inflammation of bronchi.
4 Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration.
Explanation:
(a)
NCERT ( Page-276 / N-191
BREATHING and EXCHANGE OF GASES
278146
Chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. One of the major
causes of this is cigarette smoking.
(b) Asthma is a disease caused due to an allergic reaction to foreign substances that affect the respiratory tract. In this, the airways and lungs of a person can become obstructed because they become narrow and cut off air flow. Bronchioles can constrict (narrow) because of muscle spasms.
NCERT (Page-275 / N-190
BREATHING and EXCHANGE OF GASES
278143
Emphysema developes mainly because of
1 allergy or hypersensitization.
2 spasm of the smooth muscles of bronchioles.
3 cigarette smoking.
4 inflammation of the alveoli
Explanation:
(c) Emphysema developes mainly because of cigarette smoking.
NCERT ( Page-275 / N-190
BREATHING and EXCHANGE OF GASES
278144
Which one of the following is the correct statement for respiration in humans?
1 Workers in grinding and stone-breaking industries may suffer from lung fibrosis.
2 About$90\text{ }\!\!%\!\!\text{ }$ of carbon dioxide $\left( \text{C}{{\text{O}}_{2}} \right)$ is carried by haemoglobin as carbaminohaemoglobin.
3 Cigarette smoking may lead to inflammation of bronchi.
4 Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration.
Explanation:
(a)
NCERT ( Page-276 / N-191
BREATHING and EXCHANGE OF GASES
278146
Chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. One of the major
causes of this is cigarette smoking.
