DIRECTION:Choose the letter of the best answer. Write your answer on the blank provided. 1. These parts are lined with mucus that help filter dust particles. a. nasal cavity and larynx b. nasal cavity and lungs c. nasal cavity and epiglottis d.nasal cavity and trachea 2. What is the function of the tonsils? a.they warm and moisten the air that enters through the nose b. they trap and destroy bacteria that enter through the nose c. they prevent food from entering the windpipe d. they vibrate in order to produce sounds. 3. What happens during in inhalation? a. the ribs and diaphragm contact b. the ribs and diaphragm relax 4.Where does the exchange of gases take place? a.trachea b. bronchi c. alveoli d. nostrils 5.Where is the diaphragm located? a.below the voicebox or larynx b.covering top of the voicebox or larynx c. at the bottom of the trachea d. below the lungs 6. What do you call the smallest blood vessels in the body? a. artery b. arteriole c. capillary d. venule 7. What type of blood cell depends your body from infections.? a. platelets b. red blood cell c. white blood cells d. plasma 8.On what kind of blood vessel does an oxygen-rich blood flow? a. artery b.capillaries c. vein d. venules 9. Which of the following blood vessels has the thickest walls? a.artery b.capillaries c.vein d.venules 10. Why is blood important? a. because it helps us keep healthy b. because it has water that flows with it. c. because the blood is colored red and it flows like a river d.because it delivers vital nutrients and nourishments to the body​