GENERAL HISTOLOGY

Detailed explanation-1: -The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.

Detailed explanation-2: -During this unforced inhalation our diaphragm-the dome-shaped muscle between the chest and the abdominal cavity-flattens. This expands the chest cavity and as a result air is drawn in. During exhalation the diaphragm relaxes and the lungs naturally recoil, and air is gently pushed out.

Detailed explanation-3: -Breathing out As the chest cavity gets smaller, your lungs deflate, similar to how air releases from a balloon. At the same time, carbon dioxide-rich air flows out of your lungs through the windpipe and then out of your nose or mouth.

Detailed explanation-4: -Stale air is air that is poorly circulated or not circulated at all. On its own, air that is not circulated may not be unhealthy, but it depends if certain toxins or chemicals are present, and to what degree.

Detailed explanation-5: -Exhale slowly through your mouth while pursing your lips (like whistling). This reduces the tendency for airways to collapse. While exhaling, tighten your abdominal muscles. This moves the diaphragm up and helps to get all the stale air out.