Which of the choices below determines the direction of respiratory gas movement?

Surfactant helps to prevent the alveoli from collapsing by ________.

Organ distal to the stomach

The amount of air that can be inspired above the tidal volume is called ________.

Air in respiratory passages that does not contribute to gas exchange

Area between the teeth and lips/cheeks

Wormlike sac that out pockets from the cecum

Which respiratory-associated muscles would contract if you were to blow up a balloon?

Do the following factors generally increase or decrease the respiratory rate and depth?  Increase in blood CO2

The most powerful respiratory stimulus for breathing in a healthy person is ________.