Describe the function of the hormone aldosterone.
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What is aldosterone?
Aldosterone is a hormone produced in the outer section (cortex) of the adrenal glands, which sit above the kidneys. It plays a central role in the regulation of blood pressure mainly by acting on organs such as the kidney and the colon to increase the amount of salt (sodium) reabsorbed into the bloodstream and to increase the amount of potassium excreted in the urine. Aldosterone also causes water to be reabsorbed along with sodium; this increases blood volume and therefore blood pressure.
How is aldosterone controlled?
Aldosterone is part of a group of linked hormones, which form the renin–angiotensin–aldosterone system. Activation of this system occurs when there is decrease in blood flow to the kidneys following loss of blood volume or a drop in blood pressure (e.g. due to a haemorrhage). Renin is an enzyme that leads to a series of chemical reactions resulting in the production of angiotensin II, which in turn stimulate aldosterone release. Aldosterone causes an increase in salt and water reabsorptioninto the bloodstream from the kidney thereby increasing the blood volume, restoring salt levels and blood pressure.
What happens if I have too much aldosterone?
The most common cause of high aldosterone levels is excess production, frequently from a small benign adrenal tumour (primaryhyperaldosteronism). The symptoms include high blood pressure, low blood levels of potassium and an abnormal increase in blood volume.
What happens if I have too little aldosterone?
Low aldosterone levels are found in a rare condition called Addison's disease. In Addison's disease, there is a general loss of adrenal function resulting in low blood pressure, lethargyand an increase in potassium levels in the blood (see the article on Addison's disease for further information).
Aldosterone is a hormone produced in the outer section (cortex) of the adrenal glands, which sit above the kidneys. It plays a central role in the regulation of blood pressure mainly by acting on organs such as the kidney and the colon to increase the amount of salt (sodium) reabsorbed into the bloodstream and to increase the amount of potassium excreted in the urine. Aldosterone also causes water to be reabsorbed along with sodium; this increases blood volume and therefore blood pressure.
How is aldosterone controlled?
Aldosterone is part of a group of linked hormones, which form the renin–angiotensin–aldosterone system. Activation of this system occurs when there is decrease in blood flow to the kidneys following loss of blood volume or a drop in blood pressure (e.g. due to a haemorrhage). Renin is an enzyme that leads to a series of chemical reactions resulting in the production of angiotensin II, which in turn stimulate aldosterone release. Aldosterone causes an increase in salt and water reabsorptioninto the bloodstream from the kidney thereby increasing the blood volume, restoring salt levels and blood pressure.
What happens if I have too much aldosterone?
The most common cause of high aldosterone levels is excess production, frequently from a small benign adrenal tumour (primaryhyperaldosteronism). The symptoms include high blood pressure, low blood levels of potassium and an abnormal increase in blood volume.
What happens if I have too little aldosterone?
Low aldosterone levels are found in a rare condition called Addison's disease. In Addison's disease, there is a general loss of adrenal function resulting in low blood pressure, lethargyand an increase in potassium levels in the blood (see the article on Addison's disease for further information).
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Question -
Describe the function of the hormone aldosterone.
Answer -
It is a type of steroid hormone.
It is released by zona glomerulosa of the adrenal cortex in the adrenal gland.
It's main role is to regulate the concentration of salt and water in body.
It can cause an effect on blood pressure.
It conservates sodium from kidney, salivary gland, sweat gland and colon.
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