What is the correct answer to explain the mechanism of inhalation during breathing in human beings?
1
Air moves in, Ribs move in and Diaphragm moves down
2
Air moves out, Ribs move out and Diaphragm moves up
3
Air moves out, Ribs move out and Diaphragm moves down
4
Air moves in, Ribs move out and Diaphragm moves down