Can only use headphone's speaker as a mic on Macbook 2,1

An external mic plugged into line-in does not work. But if I plug in my headphone's speaker, and speak into those, it works. Funny thing.
Although I understand technically, why such a thing is possible, I don't understand, why the microphone refuses to work. Any ideas?

Sorry, I didn't wrote that. But yes, I've tested it. I also used another headset with my macbook. Just the same.

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