bicarbonate
It prevents food from going to the respiratory system
The main function of the respiratory system is the exchange of gases. It brings in oxygen and elmiinates carbon dioxide.
The main function of the respiratory system is the exchange of gases. It brings in oxygen and elmiinates carbon dioxide.
The respiratory system cannot function without the windpipe.
excretory system
cardiovascular
Breathing
The main function of the respiratory system is to provide the body with a constant supply of oxygen.
air passage
Gas exchange
air passage