Intro to the Respiratory System 

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The Respiratory System plays a major part in our survival. The Respiratory System works hand and hand with the Circulatory System.
The circulatory system’s pulmonary circulation is what the respiratory system is all about. While the human organism is in utero development, the lungs are not actively functioning.
The circulatory system bypasses the lungs via the umbilical cord. Once the infant is BORN the lungs expand and the circulatory system reverses the blood flow to now enter the lungs carrying life supporting oxygen to the infant.
Respiration for the body can not happen without the circulation of the blood driven by the cardiovascular system… simply said...
It is through the respiratory structures that Oxygen (a gas) is directed to the lungs and passed into the blood transportation system which then delivers the Oxygen to the body…. this is half the trip.
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