What is one function of the integumentary system?

So im writing an editorial and i need understanding what this verse means from a song lyric. the editorial is about depression but i need understanding what this could mean “her feelings she hides, her dreams she can’t find. she’s losing her mind. she’s fallen behind. she can’t find her place. she’s losing her faith. she’s fallen from grace. she’s all over the place.”

If the singular term ends in -us, the plural is usually formed by changing the ending to

The pituitary gland is controlled by sex hormones true or false.