Name the instrument that a doctor uses to listen to the sound of our heartbeat.
Name the process in which we breathe in air through our nose.
Name the process in which we breathe out air.
Name the bag-like structures that are located in our chest.
Name the structure that protects our lungs.
Name the pumping organ of a human body.
Name the strong muscle that moves our chest in and out every time we breathe.
