N?u b?n c?m th?y cách phân chia này ph?c t?p thì có th? hi?u ??n gi?n h?n khi c?u t?o c?a b?m ???c phân chia thành two ph?n:The diaphragm is a crucial muscle that separates the upper body cavity from the abdominal cavity and plays a critical purpose in breathing. Any time you inhale, the diaphragm contracts and flattens, letting your lungs t