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Which of the following will bring about inhalation?

1.	Contraction of diaphragm and contraction of external intercostal muscles
2.	Relaxation of diaphragm and contraction of external intercostal muscles
3.	Contraction of diaphragm and contraction of internal intercostal muscles
4.	Relaxation of diaphragm and contraction of internal intercostal muscles.

Subtopic: Mechanism of Breathing |

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Inhalation is brought about by:

1.	Relaxation of the diaphragm and intercostal muscles
2.	Contraction of the diaphragm and relaxation of intercostal muscles
3.	Contraction of the diaphragm and intercostal muscles, decreasing thoracic volume
4.	Contraction of the diaphragm and intercostal muscles, increasing thoracic volume

Subtopic: Mechanism of Breathing |

87%

Level 1: 80%+

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