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 ID: 908472
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Slide1
Aldosterone
Controlling sodium levels
Slide2Aldosterone
Aldosterone is a
hormone
.It is secreted by the adrenal glands
Slide3Aldosterone is secreted by the
cortex
of the adrenal glands.
Slide4What 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
.
Slide5What is the role of aldosterone?
As sodium ions are reabsorbed water follows by
osmosis
into the blood.
Slide6Aldosterone also increases the excretion of potassium ions (K
+
).
The release of aldosterone is stimulated by a fall in the volume of the blood.
Slide7Hyperaldosteronism
This occurs when the adrenal glands secrete excessive amounts of aldosterone – Conn syndrome
Slide8Hypoaldosteronism
This occurs when the adrenal glands don’t secrete enough aldosterone – Addison’s disease
Slide9Sodium 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?
Slide10A 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 nausea
Poor balance blurred vision fatigue
Confusion rapid, shallow breathing
Slide11Describe 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.