Which are the 4-sub components of the cardio-respiratory 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.”

The heart and lung are located in which cavity ? thoracic

What’s the first step in handling stress? list eight strategies for managing stress. what are some physical symptoms of stress?