alleryStart learning →What kind of molecule is ADH, and where is it released from?
AA 28 amino acid peptide from the heart atria
BA 9 amino acid peptide from the pituitary
CA 21 amino acid peptide from the endothelium
DAn 84 amino acid peptide from the parathyroids
Answer & Solution
Correct answer: B. A 9 amino acid peptide from the pituitary
1. ADH is a small peptide of nine amino acids.
2. It is released by the posterior pituitary.
3. It promotes water recovery, decreases urine volume and maintains plasma osmolarity and blood pressure.
4. The 28 amino acid peptide from the atria is atrial natriuretic hormone, which does the opposite job.
5. The 84 amino acid parathyroid peptide and the 21 amino acid endothelial peptide are parathyroid hormone and endothelin.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 25 "The Urinary System", section 25.8 Endocrine Regulation of Kidney Function_
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