these results provide direct electrochemical evidence that , during stimulus-secretion coupling of the salivary epithelial cells , the neurohormone serotonin controls the secretory response by the regulation of intracellular ca2+ and induces transepithelial transport of ca2+ , thereby suggesting that , during secretion , the neurohormone causes the salivary gland to behave as a `` '' leaky epithelium '' '' by activating the paracellular shunt pathways .
C0014597
epithelial cells
C0014609
epitheliu