It helps give room for the lungs as they expand.
The 7th pair of ribs are the longest. The ribs increase in length from 1-7. From 8-12 they decrease in length.
floating rib
7th rib
The rib that attaches to the sternum by the cartilage of rib 7 is called the "7th costal cartilage" or "costal cartilage of the 7th rib."
The Sternum and the Rib Cage protects the lungs.
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Rib 7 and rib 8 have similar structures, both being curved bones that protect the chest cavity. However, rib 7 is slightly shorter and more angled than rib 8. In terms of function, rib 7 provides protection for the lower part of the chest and helps support the muscles involved in breathing, while rib 8 offers additional support and protection for the organs in the upper abdomen.
The answer depends on what you mean by "7 Th's".
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Radio Waves
Yes.
Ribs 8 through 10. The cartilage of rib 8 connects to the cartilage of rib 7. The cartilage of rib 9 connects to the cartilage of rib 8. The cartilage of rib 10 connects to the cartilage of rib 9.