Subject: Explain the reason human red blood cells are clear in the center and why...

...it helps. 

I tried researching this on my own, and this is what I came up with: 

Human red blood cells appear clear in the center because they have little 
cytoplasm.  This increases surface area to carry more hemoglobin, thus 
increasing oxygen carrying capacity, which is the main purpose of RBC. 

Please note: I am NOT lazy.  I am not using this to copy an answer.  I will be 
honest: this is for a science lab.  I have looked far and wide through many 
sources.  I promise I will not copy any portion of your writing if my question 
is answered. 

Re: Explain the reason human red blood cells are clear in the center and why...