27. Organize the items listed into the proper sequence of ev…

27. Organize the items listed into the proper sequence of events for gas exchange. a: O2 is transported to cells by the circulatory system. b: O2 is drawn into the lungs during inhalation. c: Cells use O2 and generate CO2. d: CO2 is exhaled. e: The circulatory system transports CO2 to the lungs.

28. Which answer places the following events in proper order…

28. Which answer places the following events in proper order for pulmonary ventilation? a: Thoracic cavity volume changes. b: Brainstem nuclei stimulate skeletal muscles to contract. c: Air flows down its pressure gradient. d: Dimensional changes in the thorax lead to pressure changes within the lung.