During inspiration, the diaphragm moves: a) down by contraction b) down by relaxation c) up by contraction d) up by relaxation
Option a. During inspiration, the diaphragm contracts and flattens to boom the quantity of the the thoracic cavity. This boom in quantity ends in a lower in intra-alveolar stress, that is a strain decrease than atmospheric strain and creates the strain gradient. Due to the gradient the air is from the environment is pressured within the lungs through nasal cavity.
