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Statement 1: The contraction of the diaphragm increases the volume of the thoracic chamber in the anteroposterior axis.
Statement 2: The contraction of the external intercostal muscles lifts up the ribs and sternum, increasing the volume of the thoracic chamber in the dorsoventral axis.
Question: How do the diaphragm and external intercostal muscles contribute to the process of inspiration during breathing?
The diaphragm and external intercostal muscles contract, causing a decrease in thoracic volume.
The diaphragm and external intercostal muscles relax, allowing the thoracic volume to increase.
The diaphragm contracts to increase thoracic volume in the anteroposterior axis, while the external intercostal muscles lift up the ribs and sternum to increase thoracic volume in the dorsoventral axis.
The diaphragm and external intercostal muscles contract, resulting in a decrease in pulmonary volume.
Answers (1)
According to the given statements, the contraction of the diaphragm increases the volume of the thoracic chamber in the anteroposterior axis, while the contraction of the external intercostal muscles lifts up the ribs and sternum, increasing the volume of the thoracic chamber in the dorsoventral axis. This combined action results in an overall increase in thoracic volume, facilitating inspiration. Option 3 accurately describes the contribution of both the diaphragm and external intercostal muscles during inspiration.
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