Jun 27
What Happens When You Breathe?
Breathing is the process of moving air into and out of your body is called breathing. During inhalation, the diahragm and rib muscles contract, increasing the size of the chest cavity. Exhalation, the diaphragm and muscles relax, decreasing the size of the rib cage and volume of air in the lungs.
For more details : worksheet respiration system (download here)