Biology for IGCSE & O level - Gas Exchange In Humans (Section 2 - No. 7)
Which of the following is an example of a physical change that occurs during breathing?
Gas exchange in the alveoli.
The breakdown of food in the stomach.
The contraction and relaxation of the diaphragm.
The production of hormones in the endocrine system.
Explanation
The diaphragm's movement changes the volume of the chest cavity, and thus changes the air pressure, causing inhalation and exhalation.
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