Describe the function of the intercostal muscles during inspiration. - OCR - GCSE Physical Education - Question 7 - 2020 - Paper 1

During inspiration, the intercostal muscles contract in a coordinated manner. This contraction causes the ribs to move upwards and outwards, which increases the volume of the thoracic cavity. As the thoracic cavity expands, the pressure within the lungs decreases relative to atmospheric pressure, allowing air to flow into the lungs. This process effectively facilitates the expansion of the lungs, allowing them to fill with air, which is essential for effective respiration.