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Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure. This negative pressure is achieved when
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Important Questions on Breathing and Exchange of Gases
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Read the given statements and select the correct option.
Statement 1: Mammals can eat while breathing.
Statement 2: Mammals have negative-pressure breathing.
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The ventilation movements of the lungs in mammals are governed by
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Fill up the blanks in the following paragraph by selecting the correct option.
The movement of air into and out of the lungs is carried out by creating a ____(i)____ between the lungs and the atmosphere. Inspiration can occur if intra-pulmonary pressure is ____(ii)____ than the atmospheric pressure. Expiration takes place when the intra-pulmonary pressure is ____(iii)____ than the atmospheric pressure. Inspiration is initiated by the ____(iv)____ of diaphragm which ____(v)____ the volume of thoracic chamber in the antero- posterior axis.
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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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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:
