Egyptian culture was the first to produce leavened bread, and leavened bread was a symbol of Egyptian culture. This did not mean that unleavened bread disappeared from the Egyptian diet (when Jews â or others â said, âOn all nights we eat leavened and unleavened bread,â they meant what they said), but leavened bread was preferred.
The ribcage, also called the thoracic cage, is a bony structure made up of the rib bones and their connective tissues. The ribcage forms part of the bodyâs respiratory system.
The ribs protect your heart and lungs so  they will not get bruised. They are part of the skeletal system,  but help your respiratory system to function.   This is how you say it in order  nose/mouth,trachea,bronchus,lungs,bronchioles and aveoli (air  sacs).  The human respiratory system is made up of the trachea, bronchi,  bronchioles, lungs, and diaphragm.