Assignments have a Download Submissions button but Quizzes does not. However, you can go to Statistics and click the Student Analysis button to download all of their responses in a .csv file. It's not pretty, but I've done this before and then set up a Mail Merge with Word to create individual submissions from each student with just their essay questions. This makes is much easier to view and grade with essays. Since it's not an assignment with the Download Submissions option their is no easy one step solution to send them back to students. Probably the easiest way would be in SpeedGrader using the Attach button at the bottom of the screen, attaching the file for each student individually.
Hope that helps,
Rick
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