During inhalation, the ribs move upwards. When we breathe in, the diaphragm and intercostal muscles contract. The contraction of the intercostal muscles, which are located between the ribs, causes the ribs to move upwards and outwards. This upward movement of the ribs helps to expand the chest cavity and create more space for the lungs to expand. As the lungs expand, air is drawn into the respiratory system through the nose or mouth. This process is essential for oxygen to enter the bloodstream and for proper gas exchange to occur in the lungs.