After the end of a normal inspiration, the volume of air in the lungs is about 2.8 l. normally quiet inspiration is driven by a pressure difference of about 2 mm hg. the air in the lungs is at 37 ° c and after normal expiration it is at atmospheric pressure. quiet inspiration is driven by the expansion of the chest cavity by contraction of the diaphragm, which expands the air in the lungs. how much is the air feher, joseph j. quantitative human physiology: an introduction (academic press series in biomedical engineering) (kindle locations 3177-3180). elsevier science. kindle edition.

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos