Potassium ion concentration of the extracellular fluid.

The four factors in the regulation of aldosterone secretion are: On sweet glands, salivary glands, and intestinal cells.Īldosterone increases the reabsorption of sodium and the secretion of potassium by the ducts, The effect on the sweat glands is important to conserve body salt in hot environments and the effect on the salivary glands is necessary to conserve salt when excessive quantities of saliva are lost, Aldosterone also greatly enhances sodium absorption by the intestines, which obviously prevents the loss of sodium in the stools. abundant sER, mitochondria with tubular cristae, and numerous lipid droplets.

The cytoplasm is pale eosinophilic and contains large amount of lipid droplets which appear as numerous vacuoles and so these cells are called spongiocytes).īy EM: the cells show the ultrastructural features of steroid secreting cells i.e.The cells are large polyhedral with large, pale spherical nuclei.The cords are one or two cells thick and are separated longitudinally.The cells are arranged into long straight cords, perpendicular to the capsule.It is the middle and the largest layer of the cortex, forming 65% – 80 % of the cortex.Function: the cells secrete mineralocorticoids, mainly aldosterone. sER, mitochondria with tubular cristae, and few lipid droplets. The cells are columnar or pyramidal in shape with dense nuclei and slightly vacuolated eosinophilic cytoplasm.īy EM: the cells show the ultrastructural features of steroid secreting cells i.e.The cells are arranged in closely-packed arched clusters surrounded by fenestrated blood capillaries.It lies immediately under the connective tissue capsule, forming 15% of the cortex.

Adrenal medulla location