Mechanics Of Breathing

Question 1

Expiration

Answer 1

Air goes out
Diaphragm and intercostal muscles relax
Decreases lung volume and therefore increases pressure in lungs (which is greater then that of the atmosphere) causing air to be exhaled

Question 2

Inspiration

Answer 2

Air flows into lungs
Diaphragm (flattens) and Intercostal muscles (moving upwards and outwards) contracts
Lung volume increased and pressure decreased (lower then atmospheric pressure) causing air to be inhaled

Question 3

Ventilation

Answer 3

Process by which air moves in and out of lungs

Air moves from places of high concentration to low concentration, as well from different pressures