A person can choke when a piece of food becomes lodged in the windpipe, blocking the flow of air. A first aid procedure to remove the blockage is the Heimlich manoeuvre described below:

By performing this procedure, the piece of food is pushed out of the windpipe. Which of the following causes this to happen?

Options

A. the expansion of the chest
B. the air pressed out of the lungs
C. the food pressed out of the stomach
D. the upward movement of the wall of the food pipe

Answer

B