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In scheme, a procedure application is considered as a control structure. Why is this?

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    $\begingroup$ What is your source for this? Where have you looked for an explanation? [That tag had nothing to do at all with your question...[ $\endgroup$ – Raphael Apr 9 '16 at 14:31
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The answer will depend on how you define "control structure", for which there are probably $n+1$ versions out there.

My best guess is this. Control structures change the control flow of the program from just incrementing the program counter. In usual machine-level languages, this is implemented using jumps.

Calls to functions/procedures/methods compile to jumps, among other things. Hence, they change the control flow, and we can call them "control structure".

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