Describe the movement of blood in the systemic circulation. What is the difference between gas exchange in the large

Describe the movement of blood in the systemic circulation. What is the difference between gas exchange in the large and small circulatory systems of reptiles and amphibians.

Erythrocytes of blood create oxygen bonds in the capillaries of the lungs in the molar circle of blood circulation. This is possible thanks to hemoglobin, which contains iron. In the systemic circulation, the opposite is true. The oxygen in the blood is replaced by carbon dioxide. The blood becomes venous in the systemic circulation. Amphibians also have two circles of blood circulation, as in reptiles. They have no fundamental differences in structures. The same applies to the functions of the large and small circle of blood circulation.