The correct answer would be the endocrine system. Hope this helps!
Equilibrium: Equilibrium is a state in which opposing forces or influences are balanced.
Hope this helps :)
Answer:
<em><u>Pancreas</u></em> is Insulin is released when blood sugar levels are too high
<em><u>Thymus Gland</u></em> is Your immune system fight off an infection
<em><u>Pineal Gland </u></em>is you begin to feel sleepy after a long session
<em><u /></em>
Explanation: Hope it helps :)