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13889 Anatomy

A 3-year-old child is admitted to the emergency department with a particularly severe attack of asthma. Which of the following is the most important factor in increasing the intrathoracic capacity in inspiration?

A"Pump handle movement" of the ribs-thereby increasing anterior-posterior dimensions of the thorax
B"Bucket handle movement" of the ribs-increasing the transverse diameter of the thorax
CStraightening of the forward curvature of the thoracic spine, thereby increasing the vertical dimensions of the thoracic cavity
DDescent of the diaphragm, with protrusion of the abdominal wall, thereby increasing vertical dimensions of the thoracic cavity
Anatomy
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