Differentiate inspiration and expiration or, differentiate inhalation and exhalation .

INSPIRATION or, INHALATION

i)The act of drawing air into the lungs.

ii) Rib cages move forward and upward.

iii) Contraction of external intercostal muscles and relaxations of internal intercostal muscles .

iv) Diaphragm contracts and becomes flattened.

v) The Increase in volume of the thoracic cavity.

vi) Air pressure in the lungs is less than atmospheric pressure.

EXPIRATION or, EXHALATION

i) The act of expel (out) of air from the lungs.

ii) Rib cages move downward and inward.

iii)Relaxations of external intercostal muscles and Contraction of internal intercostal muscles.

iv) Diaphragm relaxes and becomes original dome-shaped.

v) The decrease in the volume of the thoracic cavity.

vi) Air pressure in lungs is higher than atmospheric pressure.