ANATOMY

Detailed explanation-1: -When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.

Detailed explanation-2: -When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.

Detailed explanation-3: -During inhalation, the ribs create more space for the lungs by moving outwards and upwards. The diaphragm also moves downwards and flattens. This increases the space in your chest cavity, into which your lungs expand and the pressure becomes low and the air from the atmosphere moves in.

Detailed explanation-4: -When you breathe in (inhalation), the diaphragm moves down toward the abdomen, and the rib muscles pull the ribs upward and outward. This makes the chest cavity bigger and pulls air through the nose or mouth into the lungs.

Detailed explanation-5: -As you breathe out your diaphragm does the opposite of what it does when you breathe in, and relaxes, moving upward into your chest cavity. The same applies to your intercostal muscles, the muscles between your ribs, which also relax, reducing the space in your chest cavity.