FILL IN THE BLANKS GERNAL SCIENCE 8 CLASS ___ is a physical process in which gases are exchange In held air has high concentration of___ The transport system found in human called ___ system RBC contain hemoglobin which contain readily with___ The heart is a ___ pumping organ which pumps blood around the body ___ is the lungs provide a large surface area for exchange of gases When you inhale the ___ going upward and outward In held here has a ___ concentration of oxygen The human heart has ___ chamber