Abstract
1. 1. Lateral ciliary activity was studied on the ctenidium of the oyster ( Crassostrea virginica. 2. 2. The addition of potassium in excess of 50 mM is cilioexcitatory. 3. 3. Cilioexcitation caused by low frequency (10 Hz) electrical stimulation was enhanced in the presence of potassium but inhibited with bromolysergic acid. 4. 4. High frequency (50 Hz) electrical stimulation produced a cilioinhibition which could be blocked by potassium and phenoxybenzamine. 5. 5. After transaction of the branchial nerve, the yellow-fluorophore (serotonergic varicosities) and the cilioexcitatory effect of potassium are gradually eliminated. 6. 6. This study investigates the potassium effect on ciliary activity. The effect increases with low frequency and decreases with high frequency nerve stimulation.
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