The effect of the contraction of the muscles of the diaphram is that
-
he volume of the thoracic cavity increases.
- more carbon dioxide is expelled through the nostrils
- the rib cage is drawn inwards
- the intercostal muscle becomes relaxed
The correct answer is: A
Explanation
The diaphragm is the main inspiratory muscle, during inspiration(air intake) it contracts and moves in an inferior direction that increases the vertical diameter of the thoracic cavity and produces lung expansion, in turn, the air is drawn in.