can cause a decrease in the blood flow to the heart muscle.
Boys:
-Deepening in Voice
-Growth Spurts
-Pubic Hair Development
-Increased Production of Testosterone and Sperm Cells
Girls:
-Growth Spurts
-Pubic Hair Development
-Menstrual Cycle Begins
-Increased Production of Estrogen and Eggs
Find a new hobby to start and maybe do a self transformation and create a new image of yourself. Try to always think of the positive things in your life
I'm not sure, but I think that its your skin that protects the internal tissues.