Abstract
The extracellular fluid volume (inulin space) of salivary glands obtained from rapidly engorging females of the lone star tick, Amblyomma americanum (L.), incubated for 30 min with a Ringer-saline containing 10−5 M adrenaline, was almost twice that observed in glands incubated with the same Ringer-saline but without adrenaline. At the same time the total tissue water content increased from 74.6 to 88.2% in the adrenaline-incubated glands. In computing the absolute increase in tissue water, it was surmised that most of the increase brought about by incubating glands with adrenaline occurred in the extracellular space. The significance of this finding to the mechanisms of fluid transport across tick salivary glands is discussed.
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