state the role of diaphragm and rib muscles in breathing?
Answers
Answer:
The diaphragm is attached to the base of the sternum, the lower parts of the rib cage, and the spine. As the diaphragm contracts, it increases the length and diameter of the chest cavity and thus expands the lungs. The intercostal muscles help move the rib cage and thus assist in breathing.
Answer:
The diaphragm and intercostal muscles (external and internal) present between the ribs help in generation of a pressure gradient between the lungs and the atmosphere.
During inspiration diaphragm is lowered by contraction of its muscle fibres and becomes flat. The external intercostal muscles contract pulling the ribs and sternum upward and outward.
This increases the volume of thoracic cavity and thus, decrease the intra-pulmonary pressure. The greater atmospheric pressure outside the body now causes the air to flow rapidly into external nares, which sequentially leads to alveoli. Thus, causing inspiration.