Labels:daily OCR: IBS OU HA VE twelve pairs of slim bones called ribs They curve around your chest from your spine to your breastbone form "rib cage which protects your heart and lungs Some m uscles between the ribs contract enlarge the rib cage when rou breathe in sucking in air Most of vour ribs are attached to your breastbone, and are called true ribs The eighth. ninth and tenth ribs are not attached directly and are called "false" ribs The bottom two pairs of ribs are attached the m uscles of the abdominal wall, and are called floating ribs. YOUHAVE suck
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