Hydrostatic Balancing Mechanism of Xenopus Larvae

Abstract
Experiments are described which show that larvae of the South African clawed toad Xenopus possess a reflex mechanism which enables them to maintain a stable position in the water, independent of hydrostatic pressure. From observations on the behavior of the animals and recordings from the saccular macula of the ear, the conclusion is drawn that the lung of the animal generates an alternating signal, which is frequency modulated by the hydrostatic pressure. This signal is transmitted to the ear, and is utilized to maintain balance. A conceptual model for the reflex is proposed.

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