1. Inhalation is explained in a sequence:
   1. Air is inhaled
   2. Rib cage rises. This is indicated by arrows pointing outward.
   3. Diaphragm contracts
2. Exhalation is explained in a sequence:
   1. Air exhaled
   2. Rib cage lowers. This is indicated by arrows pointing toward the rib cage.
   3. Diaphragm relaxes