Which of the following is responsible for keeping the respiratory tract clear of mucus and debris? Select one: a. surfactant O b. alveoli o c. cilia d. pharynx The exchange of carbon dioxide and oxygen between the air and the blood is called: Select one: a internal respiration b. cellular respiration c. breathing d. external respiration Which vessel contains blood with the greatest concentation of reduced hemoglobin? -Z Select one: o a. X b. W c. Z O d. Y The process of inspiration is accomplished by: Select one: a. relaxation of the intercostal muscles O b. increased air pressure in the thoracic cavity c. relaxation of the diaphragm muscle O d. reduced air pressure in the thoracic cavity

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