EASY
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Which of the following changes occur in diaphragm and intercostal muscles when expiration of air takes place?

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Important Questions on Breathing and Exchange of Gases

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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
After forceful inspiration, the amount of air that can be breathed out with maximum forced expiration is equal to
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
The process in which atmospheric air with 21% of O2 is drawn in and alveolar air rich in CO2 is sent out is called        
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
The lungs are spongy and elastic due to _______.
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
Which is the correct sequence of the air passage in man?
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans

Select the correct events that occur during inspiration.

(a) Contraction of diaphragm
(b) Contraction of external intercostal muscles
(c) Pulmonary volume decreases
(d) Intrapulmonary pressure increases

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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
Involuntary breathing is controlled by the
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
Define vital capacity. What is its significance?
MEDIUM
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
Which of the following changes occur in diaphragm and intercostal muscles when expiration of air takes place?
EASY
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
Exhalation is the process of expulsion of air through the respiratory tract. Which figure illustrates the process of exhalation?
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
All of the following options are correct except::-

i. TLC = VC + RV

ii. VC = ERC + IRV

iii. VC = IRC + ERV

iv. RV = TLC - ERV + TV + IRV
MEDIUM
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
What is tidal volume? Find out the tidal volume (approximate value) for a healthy human in an hour.
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
A person breathes in some volume of air by forced inspiration after having a forced expiration. This quantity of air taken in is:
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
What is the vital capacity of lungs.
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
The volume of air that will remain in the lungs after a normal expiration is called
EASY
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans

Match the following

Column I Column II
a. Tidal volume (i) 1100 to 1200 ml
b. Inspiratory reserve volume  (ii) 500 ml 
c. Expiratory reserve volume (iii) 2500 ml to 3000 ml
d. Residual volume (iv) 1000 ml to 1100 ml
MEDIUM
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
State the volume of air remaining in the lungs after a normal breathing.
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
Intercostal muscles are attached to:
MEDIUM
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
Distinguish between inspiratory capacity and expiratory capacity.
MEDIUM
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
Distinguish between IRV and ERV.
MEDIUM
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing in Humans
Explain the process of inspiration under normal conditions.