PHYSIOLOGY OF BREATHING**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

HOW YOUR LUNGS WORKThe first stage of breathing, inhaling air into your lungs, is called inspiration or inhalation.Inspiration happens because of a large breathing muscle called the diaphragm, which is located underneath the lungs in the ribcage.**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

THE BREATHING MUSCLESWhen you inhale, the diaphragm and muscles between your ribs contract, creating negative pressure or vacuum inside your chest cavity.The negative pressure draws the air that you breathe into your lungs.**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

INFLATION OF THE LUNGSLungs are not hollow like balloons, but are made of spongy, flexible tissue that inflates when filled with air. So, how does the air get in there? Where does it go? Lets follow a breath of air from start to finish.

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

TAKING ABREATHWhen you take a breath, the air goes in through your nose and mouth and travels down your throat, through your voice box and into the trachea, which is also known as the windpipe.

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

ENTERING THELUNGSThe end of your trachea splits into an upside down Y-shape and forms the bronchi. Air passes through either the right or left bronchus into both sides of the lungs.

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

ENTERING THE BRONCHIALTREEInside of the lungs, the bronchi branch off into bronchioles, which look similar to branches of a tree. **PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

BRANCHING OUT INTOBRONCHIOLESThe air flows through the bronchioles, which keep getting smaller until the air reaches the ends of the branches.**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

FILLING UP AIRPOCKETSAt the ends of the bronchioles are clusters of little pockets that collect the air, called alveoli.**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

GASEXHANGEWhen the air reaches the alveoli, oxygen diffuses through the membrane into small blood vessels called capillaries, and carbon dioxide diffuses from the blood in the capillaries into the alveoli.**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

BLOWING IT ALLOUTThe second stage of breathing, blowing air out of the lungs, is called expiration or exhalation. After the oxygen and carbon dioxide trade places in the alveoli, the diaphragm relaxes and positive pressure is restored to the chest cavity. This forces the used air out of the lungs, following the reverse of the path that it used to get in the lungs. The entire breathing process is repeated 10 to 20 times per minute in a healthy adult.

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING

**PHYSIOLOGY OF BREATHING

PHYSIOLOGY OF BREATHING