Figure 1.

Cumulative urine excretion as a function of time in yellow fever mosquitoes injected with of Na⁺ and K⁺ loads. Hyperbolic and linear slopes are urine excretion rates in response to respectively the injection of Na⁺ and K⁺ loads. The hemolymph of mosquitoes was injected with 900 nl containing 146 mM Na⁺ or 68 mM K⁺. The mosquito excreted the Na⁺ load in less than 1 h and the K⁺ load in 2 h. The excretion of the Na⁺ load is hyperbolic with time, consistent with the role of the natriuretic hormone. The excretion of the K⁺ load is linear with time which does not suggest the role of a specifically kaliuretic hormone. Adapted from Hine et al.⁹