Question: Can I install a graphics card into my All-in-one pc?

Though many might say that to just search it, I haven't found much answers, so I'm asking you fellow folks for an answer. I can pretty much only afford a preset pc and can't afford a bigger desk with a tower, so my only choice is an all-in-one. Now I love playing games, but it seems that my computer is not much of "game compatible" computer. I mean I am able to run games smoothly, but like MMORPGS? No. So that's just a little background information. I've always wanted to get a Nvida GeForce 610, but I'm not that sure if I'm able to install it. Here is my PC:
Windows 10
System:
Processor: Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz 2.60GHz, 2 Cores, 4 Logical Processors
Installed Memory (RAM): 8.00 GB
System type: 64-bit Operating System, x64 based processor
System Manufacturer: ASUSTeK Computer INC.
System Model: ET2321I
 
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