Understanding Aldosterone and Sodium Regulation in the Body
"Learn about aldosterone, a hormone that plays a crucial role in controlling sodium levels in the body. Discover the functions of aldosterone, effects of its imbalances, and the importance of sodium balance for overall health. Explore the risks of sodium chloride deficiency and excess, and how they can impact a person's well-being."
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Presentation Transcript
Aldosterone Controlling sodium levels
Aldosterone Aldosterone is a hormone. It is secreted by the adrenal glands
Aldosterone is secreted by the cortex of the adrenal glands.
What is the role of aldosterone? The primary role of aldosterone is the maintenance of a constant level of sodium ions (Na+) in the plasma of the blood. When aldosterone is secreted into the blood the kidneys actively reabsorb sodium ions from the filtrate.
What is the role of aldosterone? As sodium ions are reabsorbed water follows by osmosis into the blood.
Aldosterone also increases the excretion of potassium ions (K+). The release of aldosterone is stimulated by a fall in the volume of the blood.
Hyperaldosteronism This occurs when the adrenal glands secrete excessive amounts of aldosterone Conn syndrome
Hypoaldosteronism This occurs when the adrenal glands don t secrete enough aldosterone Addison s disease
Sodium and the body research task What are the short and long-term effects of sodium chloride (salt) deficiency on a person s health? When might a person be at risk of losing too much salt from their body? Why is too much salt in our diet dangerous to our health? Which health problems might too much salt cause us?
A person visits a hot country.. They start to feel ill because their blood pressure is low. The low blood pressure was caused by sodium chloride deficiency. Give two symptoms they might experience due to low blood pressure. Headache dizziness Poor balance blurred vision Confusion rapid, shallow breathing nausea fatigue
Describe how the adrenal cortex responds to low blood pressure Releases aldosterone Which causes the reabsorption of sodium ions (in the distal convoluted tubules) More water is reabsorbed by the kidney and so blood pressure rises.
