A misunderstanding.
That's not how breathing actually works. Your rib cage is all but immobile.
inhaling
Breathing
breathing ant it
It is air that does it, as well as the rib muscles themselves. The diaphragm contracts, expanding the internal area of the thoracic (chest) cavity, causing a drop in pressure. Air is then drawn through the nose into the lungs, which expand, causing the ribs to move to accomodate this.
The muscles that make the pupil smaller or bigger, or the retina, contain pigment, and the color of pigment is based on your genes.
Bigger lungs, more air.
yes because organs are made up of tissues and so are muscles and for the lungs to move they need the muscle. So yes your lungs do have muscles.
The easy answer is, neither bigger or smaller. Your butt is just sitting there. Think of aerobic exercise as a whole body exercise. However, it will get smaller if you are starting with a more than average fat supply. And, if your intensity and mileage is high enough, you will be building muscle in your legs, and butt area, but most people will not experience a bigger butt.
The diaphragm moves down to make the lungs expand (inhalation)
by lying By excercising
Chicken
bigger (*or closer*)
Yes, during puberty your muscles will (in general) get bigger and develop.
The term for moving muscles in order to make air flow into and out of the lungs is breathing. The main muscle that moves is the diaphragm, which sits just below the lungs and causes air to flow in and out as it contracts and expands.