WAEC - Biology (2022 - No. 12)
Use the following processes to answer this question.
I-Ribs move upward and outward
II- Diaphragm relaxes
IIl-Volume of thorax increases
IV-Air is forced out of the lungs
which of the following processes is a direct result of contraction of the intercostal muscles?
I
II
III
IV
Explanation
The process that is a direct result of the contraction of the intercostal muscles is I - Ribs move upward and outward.
When the intercostal muscles contract, they pull the ribs upward and outward, which helps to increase the volume of the thorax, allowing air to be drawn into the lungs.
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