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What is functional residual capacity?

Important Questions on Breathing and Exchange of Gases

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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?
EASY
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
After forceful inspiration, the amount of air that can be breathed out with maximum forced expiration is equal to
EASY
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Lungs are made up of air-filled sacs the alveoli. They do not collapse even after forceful expiration, because of:
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Match the items given in Column I with those in Column II and select the correct option given below:
 
  Column – I   Column – II
a. Tidal volume i. 2500 – 3000 mL
b. Inspiratory Reserve volume ii. 1100 – 1200 mL
c. Expiratory Reserve volume iii, 500 – 550 mL
d. Residual volume iv. 1000 – 1100 mL
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Write the steps of expiration steps in human being.
HARD
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing

An adult mammal with 50 kg body weight has the following functional parameters of its lungs. Inspiratory reserve volume =40 ml/kg body weight; Expiratory reserve volume =15 ml/kg body weight; Vital capacity =60 ml/kg body weight; Breathing rate =20/min.

The volume (in litre) of air that its lungs displace in 24 hours is-

EASY
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Lungs does not collapse between breaths and some amount of air will always remain in the lungs which can never be expelled because,
EASY
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
The amount of air that is left behind in lungs after expiratory reserve volume has been exhaled is
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Inspiratory reserve volume (IRV) is normally between _____.
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Draw a labelled diagram of the mechanism of inspiration and expiration.
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Explain the mechanism of inspiration and expiration.
EASY
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing

Match the following respiratory capacities and respiratory volumes of a normal human adult?

Respiratory capacities Respiratory volumes
i) Residual volume a)  2800 mL
ii) Vital capacity b)  3000 mL
iii) Inspiratory reserve volume c)  1100 mL
iv) Inspiratory capacity d)  4000 mL

 

HARD
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
When does the increase in the volume of thoracic chamber take place in the dorsoventral axis? 
EASY
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing

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
The inspiratory reserve volume + tidal volume + expiratory reserve volume is the same
EASY
Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Define vital capacity. What is its significance?
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
The volume of air that will remain in the lungs after a normal expiration is called
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Which of the following changes occur in diaphragm and intercostal muscles when expiration of air takes place?
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
The movement of the ribs is controlled by a group of muscles known as _____ muscles. (Cardiac/Intercostal)
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Biology>Human Physiology>Breathing and Exchange of Gases>Mechanism of Breathing
Explain the process of inspiration under normal conditions.