1 Single breath of 100% O2. 2  During the following expiration, [N2] increases from 0% (pure dead space gas) to equilibrium (pure alveolar gas) (i.e. plateau). 3  Using [N2] vs. 4  graph, anatomical dead space is taken to be at the mid-point of the transition from conducting zone to gas exchange zone.
Best Black Garden Hose Holder wall mount-Durable , very powerful hanger it can hold 100ft heavy hose -keep your backyard neat and clean. Currently unavailable. We don't know when or if this item will be back in stock.
The corrugated plastic mounting bracket is also great for homes and neighborhoods. Move signage from the lawn to a pipe or telephone pole around the neighborhood to spread information to neighbors. Use this hardware to attract attention to yard sales, parties, property rentals, receptions and much more.