![]() ![]() ![]() Aldosterone also stimulates the retention of sodium ions by cells in the colon and by the sweat glands. In the kidneys, aldosterone increases the reabsorption of sodium ions and the excretion of potassium ions. These hormones help control the balance of mineral salts (electrolytes) in the body. Mineralocorticoids are produced in the zona glomerulosa and include the hormone aldosterone. Figure 9.6.4 The three zones of the adrenal cortex - as well as the adrenal medulla - are each associated with a specific type of hormone. Each type is produced by a different zone of the adrenal cortex, as shown in Figure 9.6.4. There are three types of corticosteroids synthesized and secreted by the adrenal cortex. A steroid hormone and its receptor form a complex that enters the cell nucleus and affects gene expression. As steroid hormones, corticosteroids are endocrine hormones that are made of lipids and exert their effects on target cells by crossing the plasma membrane and binding with receptors within the cytoplasm. Hormones produced by the adrenal cortex are known by the general term corticosteroids. ![]()
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