The ribs are able to increase and decrease in size because of the gliding motion of the ribs enabled by small joints between the ribs and the thoracic vertebrae.
<h3>What are the ribs?</h3>
The ribs are a pair of of twelve bones which form the thoracic cavity,
The ribs are very important as the help to protect the soft tissues and organs in the thoracic cavity such as the heart.
The ribs are able to increase and decrease in size because of the small joints between the ribs and the vertebrae which permit a gliding motion of the ribs.
Learn more about ribs at: brainly.com/question/193872
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