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Which of the following sequences is correct to initiate inspiration?
(i) The contraction of external intercostal muscles raises the ribs and sternum.
(ii) Volume of thorax increases in the dorso-ventral axis.
(iii) Intrapulmonary pressure decreases.
(iv) Diaphragm contraction.
(v) Air rushes into lungs.
(vi) Volume of thorax increases in the anterior-posterior axis.
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Important Questions on Breathing and Exchange of Gases
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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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During expiration, the diaphragm becomes
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Exhalation is the process of expulsion of air through the respiratory tract. Which figure illustrates the process of exhalation?
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The given figure illustrates the changes in lung volume during the process of breathing.
The change from II to III indicates the:
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According to Boyle's law, the product of pressure and volume is a constant. Hence,
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Which of the following statements about the mechanism of ventilation/breathing is incorrect?
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A person breathing normally at rest, takes in and expels approximately half a litre of air during each respiratory cycle. This is called
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Which one of the following statements is incorrect?
