Your diaphragm lowers and your ribs expand outwards
When your diaphragm moves up and your ribs move down and in, you are exhaling. The diaphragm is relaxed when it is in the "up" position.
You are exhaling with your diaphragm moves up and your ribs move down and in. When your diaphragm moves down, you are inhaling.
Inspiration
the diaphragm. It is right above the heart and lungs, and expands and contracts when you breathe in and out. You can almost feel it move down a little, when you release air.
you inhale when your diaphragm contracts.
I believe the ribs are there to protect our lungs, heart etc. When we breath in, what we are actually doing is telling our diaphragm to contract, which moves it in a downwards motion. This caused pressure in our lungs to lower which pulls in air.
Upwards, toward the head.
Diaphragm
the diaphragm is a muscle located below the lungs. When the muscle tissue of the diaphragm contracts, it moves down, creating a vacuum inside the lungs, and pulling air into them. To breathe out, the diaphragm simply relaxes, springs back up, and the air is expelled. Not all of the air ever comes out of the lungs during an exhale.
The diaphragm is a muscle that moves or pushes up your lung when you exhale and down when you inhale in order to allow more space for oxygen to fill your lung. Also, your chest expands as you breath in and relax as you exhale.
The diafragm moves downward and the intercostal muscles contract pushing the chest outward and upward causing negative pressure in the lung structure - air will allways move from a high pressure area to a low pressure area, hence, into the lungs.
When you breath, your lungs can go up and out a little, but mostly, your lungs go down. The breathing device is the diaphragm, a sheet of muscles going across your chest inside front to back. As the diaphragm 'bends' itself down, the lungs have to move with it and get bigger. When the lungs get bigger, they have no choice but to suck in more air through the mouth or nose. When the diaphragm 'bends' or moves upward, air is pushed out of the lungs.
Stairs
No, it pulls down to draw air into the lungs.
Inferior to the lungs is the diaphragm that is domed in shape when relaxed and flatter when contracted.