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Aldosterone release causes sodium and water retention, which causes increased blood volume, and a subsequent increase in blood pressure, which is sensed by the baroreceptors. [39] To maintain normal homeostasis these receptors also detect low blood pressure or low blood volume, causing aldosterone to be released.
Aldosterone causes the renal tubules to increase the reabsorption of sodium which in consequence causes the reabsorption of water into the blood, while at the same time causing the excretion of potassium (to maintain electrolyte balance). This increases the volume of extracellular fluid in the body, which also increases blood pressure.
This in turn results in an increase of blood pressure and blood volume. Aldosterone is produced in the zona glomerulosa of the cortex of the adrenal gland and its secretion is mediated principally by angiotensin II but also by adrenocorticotrophic hormone (ACTH) and local potassium levels.
This, therefore, reinforces the measures described above (under the heading of "Arterial blood pressure"), which defend the arterial blood pressure against changes, especially hypotension. The angiotensin II-stimulated aldosterone released from the zona glomerulosa of the adrenal glands has an effect on particularly the epithelial cells of the ...
Aldosterone synthase is a protein which is only expressed in the zona glomerulosa [5] of the adrenal cortex and is primarily regulated by the renin–angiotensin system. [6] It is the sole enzyme capable of synthesizing aldosterone in humans and plays an important role in electrolyte balance and blood pressure. [7]
Aldosterone synthase normally is not ACTH sensitive, and is only activated by angiotensin II. [citation needed] Aldosterone causes the tubules of the kidneys to retain sodium and water. This increases the volume of fluid in the body and drives up blood pressure. [citation needed] Steroid hormones are synthesized from cholesterol within the ...
For example, aldosterone functions to raise blood sodium levels and lower blood potassium levels by targeting the kidneys. Specifically, it binds receptors of cells that comprise the distal tubules of the kidneys which then stimulate ion channels to conserve sodium and excrete potassium. [3] Additionally, the ion gradient initiates conservation ...
Angiotensin II also causes the adrenal glands to release aldosterone, which stimulates the epithelial cells of the kidneys to increase re-absorption of salt and water, leading to raised blood volume and raised blood pressure. So elevated renin levels in the blood (normally 1.98-2.46 ng/ml in the upright position) [40] leads to hypertension. [2 ...