What would happen if you had a decrease in the number of your white blood cells?

a. nothing - other cells would take over the function of the white blood cells.
b. you would be healthier.
c. you would be more likely to get sick due to pathogens (bacteria, virus, etc.)

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.