1) Which of these is the main function of the respiratory system? a) digesting and absorbing nutrients b) transporting materials c) breathing d) responding to stimuli e) regulating temperature f) gas exchange of O2 and CO2 2) What is the function of the trachea? a) To make sound b) It is the wind pipe. c) To absorb oxygen. d) To release CO2. e) To moisten the air we breathe in. f) The contract and relax. 3) What is the "breathing muscle" called? a) pharynx b) larynx c) trachea d) bronchi e) alveoli f) diaphragm 4) What is the path of air into the body? a) pharynx, trachea, bronchii, bronchioles, alveoli b) nasal cavity, bronchi, trachea, lungs c) esophagus, lungs, diaphragm, bronchi, alveoli 5) Why do we breathe in oxygen? a) so our lungs can get exercise b) so our cells can get air c) to replace the CO2 we exhale d) so our cells can make energy e) because all living things need oxygen f) because it is a vital nutrient for our bones 6) What organ functions as our voice box? a) nasal cavity b) mouth c) pharynx d) trachea e) alveoli f) larynx 7) The lungs bring ____ into our bloodstream and remove _____ from our bloodstream. a) H2O, CO2 b) O2, CO2 c) CO2, O2 d) glucose, O2 e) CH4, H2O 8) What are TWO WAYS that air can enter the pharynx? (pick 2) a) nasal cavity b) bronchi c) diaphragm d) trachea e) mouth f) alveoli 9) The millions of tiny air sacs that inflate when we infale air are called ____. a) larynx b) bronchi c) diaphragm d) trachea e) mouth f) alveoli 10) Which of these activities will harm your respiratory system? a) drinking water  b) running c) smoking / vaping d) eatling fresh fruits & veggies e) deep breathing f) playing outside

Respiratory System

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