1. Which part does oxygen from the air enters the bloodstream?
A. alveoli
B. nasal cavity
C. pharynx
D. pulmonary vein
2. Which shows proper care of the respiratory system?
A. smoking
B. taking a bath regularly to avoid infections
C. exercising sometimes to keep the body strong
D. wearing a face mask when there is an inspection
3. Which pathway describes the movement of exhaled air?
A. bronchi --> trachea --> nose
B. diaphragm --> air sacs (lungs) --> trachea --> nose
C. air sacs (lungs) --> bronchi --> trachea --> pharynx --> nose
D. diaphragm --> air sacs (lungs) --> bronchi --> trachea --> pharynx
4. Which parts are lined with mucus that helps filter dust particles? Nasal cavity and _______.
A. bronchi
B. larynx
C. lungs
D. trachea
5. When you exhale, how does the diaphragm help air leave the body?
A. expanding the lungs
B. making the chest larger
C. pushing air into the lungs
D. making the chest smaller