Biology for IGCSE & O level - Gas Exchange In Humans (Section 2 - No. 49)
Which of the following statements best describes the relationship between the diaphragm and breathing?
The diaphragm contracts to decrease the volume of the chest cavity, leading to exhalation.
The diaphragm relaxes during inhalation, pulling the lungs downwards and increasing their volume.
The diaphragm contracts, increasing the volume of the chest cavity, leading to inhalation.
The diaphragm has no direct role in the breathing process.
Explanation
Contraction of the diaphragm increases the chest cavity volume, drawing air into the lungs; the diaphragm relaxes during exhalation
Comments (0)
