Question

What are the functions of the following in breathing?
(a) Ribs
(b) Diaphragm
(c) Abdominal muscles

Answer 1

The functions of the respective structures are as follows:
(a) Ribs - The intercostal muscles stretch between the ribs which causes its outward and inward movement which enlarges the chest cavity all around.
(b) Diaphragm - The diaphragm flattens from the dome-shaped outline to an almost horizontal plane upon contraction.
(c) Abdominal muscles - It helps to increase the size of the thoracic cavity through the motion of the diaphragm which assists in inspiration.