Biology / Unit 12 Bio 2961 short lesson, about 20 seconds
Endocrine Glands With Secondary Function
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The idea
Several organs whose main role is non-endocrine also secrete hormones: the heart releases atrial natriuretic peptide, the kidneys release renin, the gut releases gastrin and secretin.
In practice
Atrial natriuretic peptide, released when the heart's atria stretch under high blood volume, lowers sodium reabsorption.
Where people slip
A secondary endocrine role does not make an organ part of the primary gland set, though its hormone enters circulation.
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