$(document).ready(function() {
    $('.expandButton').click(function() {
         $('.expandableSection').toggle("slide");
    });
});

<h1 class="expandButton"></h1>
<div class="expandableSection">
</div>

<h1 class="expandButton"></h1>
<div class="expandableSection">
</div>

<h1 class="expandButton"></h1>
<div class="expandableSection">
</div>