Can I replace those arrow icons with some other controls

Situation: I have a GUI containing different rows. At the end of each row there is an arrow indicating you might show some more info by clicking on that arrow. I do not think this is a good solution because:

  1. The control has to be more "visual obvious".
  2. The "click area" has to increase.
  3. It has to be more obvious what the control actually does.

Question: Is there a better way to open/close a textblock instead of using those arrows (one marked with a circle in the image below)?

Oh, and never mind the language (it's in Swedish), please just focus on the input.

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