PATHOLOGY

Detailed explanation-1: -At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.

Detailed explanation-2: -Intercostal Muscles Function In humans, the intercostal muscles play a large part in breathing. During inhalation, the diaphragm is relaxed, allowing the lungs to expand. The innermost intercostal muscles relax, while the external intercostal muscles contract, causing the chest cavity to expand.

Detailed explanation-3: -During inhalation, the ribs create more space for the lungs by moving outwards and upwards. The diaphragm also moves downwards and flattens. This increases the space in your chest cavity, into which your lungs expand and the pressure becomes low and the air from the atmosphere moves in.

Detailed explanation-4: -The movement of the rib cage is controlled by the intercostal muscles, and the diaphragm is a skeletal muscle. During inspiration the diaphragm and the external intercostal muscles contract, causing an increase in the thoracic cavity volume.