Which of the Following Statements Are True of External Respiration

question 6

Multiple Choice

Which of the following statements are true of external respiration and internal respiration (Select all that apply) ?

• A)The "P" in PO2 means "presence" of oxygen.
• B)In the alveoli,PCO2 is low and PO2 is high.
• C)In the tissues,PO2 is high and PCO2 is low.
• D)Internal respiration takes place in the pulmonary capillaries.
• E)External respiration takes place in the nasal cavities as the air is warmed.
• F)The pressure gradient of a gas is much the same as a concentration gradient.