Which statement best describes anatomical dead space?
Correct answer: B. Air in conducting passages that does not exchange gases
- A. Air in alveoli that receives no blood flow
- B. Air in conducting passages that does not exchange gases
- C. Air remaining after maximum forced expiration
- D. Air exchanged during normal quiet breathing
Explanation
Anatomical dead space includes air in the nose, pharynx, larynx, trachea and bronchi, where gas exchange does not occur. Alveoli with poor blood flow represent physiological dead space rather than anatomical dead space.
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About Respiratory System
The respiratory system includes the air passages, lungs, pleura, alveoli and the mechanics of breathing. It explains pulmonary ventilation, gas exchange, oxygen and carbon dioxide transport, regulation of breathing, and the difference between external respiration in the lungs and internal respiration in body tissues.
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