Muscular strength is how much you can lift/push/pull, ect. Muscular endurance is how long you can do something with your muscles. Like if you have to put your are straight out in front of you and hold a 25 pound dumbbell. Your will get tired and give out. the more Muscular endurance you have the longer you can do something with your muscles.
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To support good mental health you can go to therapy or therapuetic sessions, go to support groups in areas you would like to work on, eat right, exercise, have positive thoughts, surround yourself around people who make good choices, pray, etc
The blood ph level is not maintained by the respiratory system.
Anorexia or purging otherwise known as bulimia.