I. Direction: write the CAPITAL letter of the best answer before the item number.
___1. what is the main function of the respiratory system? A. to break food down B.to circulate the blood C. supply the blood with oxygen D. supply the blood with carbon dioxide
___2 At what structures in the lungs does the exchange of oxygen and carbon dioxide take place? A. alveoli B. bronchi C. bronchioles D. trachea
___3. if solid and liquid wastes are removed from the body through defecation and urination, what is released by the body as waste during respiration? A. carbon dioxide B. oxygen gas C. sweat D. salts
___4. which is the correct pathway of oxygen to the lungs? A. nose, bronchi, trachea, larynx, pharynx, alveoli B. nose, larynx, pharynx, alveoli, bronchi, bronchioles C. nose, larynx, trachea, bronchi, bronchioles, alveoli D. nose, trachea, alveoli, pharynx, bronchi, larynx
5. which of the following statements about the human circulatory system is NOT true? A. all arteries conduct blood away from the heart while veins conduct blood towards the heart B. all arteries conduct oxygenated blood while all veins conduct deoxygenated blood C. all arteries have relatively thicker wall than veins D. all arteries generally conduct blood at much higher pressure
