Epidermal cells synthesize this vitamin when exposed to sunlight. epidermal cells synthesize this vitamin when exposed to sunlight. vitamin a vitamin d3 vitamin c vitamin e vitamin d2

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.

a symbiotic relationship with the mitochondria