How does kidney disease affect the immune system? a - it strengthens it. b - it weakens it. c - it does not affect it. d - none of the above.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.