these results are consistent with the view that 1 ) a na-ca exchange process operates across the basolateral surface of the granular epithelial cells of the toad urinary bladder in vivo , and 2 ) the level of free calcium in the granular cell cytosol plays a modulatory role in the control of apical membrane water and sodium permeability by vasopressin , and in the regulation of the basal rate of transepithelial sodium transport .
C0007634
cell
C1383501
cytosol