Substances that are naturally produced by certain microorganisms that can inhibit or destroy other microorganisms are called

antibiotics

Antibiotics, also known as antibacterials, are medications that destroy or slow down the growth of bacteria.

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.