When you take a deep breath what expans in you ribs?

When you take a deep breath, your diaphragm contracts and moves downward, creating more space in your chest cavity. This action causes your lungs to inflate, and as they expand, your ribcage also expands to accommodate the increased volume of air. The intercostal muscles between the ribs assist in this expansion, allowing your ribcage to lift and widen, facilitating the intake of oxygen.