Imagine seeing the sun shining through the window. This anatomical dead space limits the size of snorkel tubes a snorkel tube merely extends the anatomical dead space, and if the tube were too long, the tidal volume would keep circulating air within this larger dead space, and you would not get the oxygen you need (this also explains why old diving suits needed pumps to continually force air down to the divers below). This region consists of the nasal cavity, mouth, pharynx, trachea, bronchi, and bronchioles. That leaves a volume of 150 ml that the air must pass through in order to get to the respiratory portion that smaller volume is also called the conducting portion. (LifeART©1989-2001, Lippincott Williams & Wilkins) Conducting PortionĪ typical breath (or tidal volume) is about 500 ml, but of that portion only about 350 ml actually are involved in gas exchange (O 2 in, and CO 2 out) that region is called the respiratory portion. Figure 13.1 The organs of the upper and lower respiratory system.
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