Is any of this information invalid?
One day a red blood cell was formed. It looked just like any other red blood cell, long and flattened in the middle—kind of like shallow bowl. Though he was smaller than other cells, he was mighty. For you see, red blood cells have the important job of transporting oxygen throughout the body and removing carbon dioxide. The little red blood cell contains a red protein called hemoglobin in which is accountable for moving oxygen in the blood of vertebrates.
As the red blood cell is transported in plasma, the yellow liquid in which moves blood cells...

Question

Is any of this information invalid?
One day a red blood cell was formed. It looked just like any other red blood cell, long and flattened in the middle—kind of like shallow bowl. Though he was smaller than other cells, he was mighty.  For you see, red blood cells have the important job of transporting oxygen throughout the body and removing carbon dioxide.  The little red blood cell contains a red protein called hemoglobin in which is accountable for moving oxygen in the blood of vertebrates. 
	As the red blood cell is transported in plasma, the yellow liquid in which moves blood cells...

anonymous · Answer

...throughout the body, by veins, it goes through the heart, A tissue structure that pushes blood to your body, out by arteries then to capillaries and back to veins. Some blood cells go everywhere but the lungs or muscles in your chest that let your body take in oxygen from the air. That’s called the systemic circulation. The only blood circulation that goes to the lungs is the pulmonary circulation. The other type of blood cells are white blood cells in which overwhelm and digest bacteria and fungi within the body.
	Oxygen is carried through the lungs, then clings onto red blood cells as they pass through the alveoli. This blood is called oxygenated blood. After the oxygen is delivered to the parts of the body, the blood is now called deoxygenated blood. Carbon dioxide is collected in this process which is in fact called cellular respiration.

thomaster · Answer

Great job!

Only 1 thing:

"Some blood cells go everywhere but the lungs or muscles in your chest that let your body take in oxygen from the air. That’s called the systemic circulation. The only blood circulation that goes to the lungs is the pulmonary circulation."

This is a little vague. 

I think you can better describe the path that the blood has to follow to become deoxygenized in the sytemic circulation and then returns to the heart which pumps the blood to the pulmonary systems where the blood gets reoxygenated in the lungs.