Peptide hormone

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Peptide hormones are hormones comprised of polypeptide chains. Peptide hormones can have either short polypeptide chains or long polypeptide chains, examples of each are oxytocin and growth factors respectively[1]. Peptides that are secreted are stored within vesicles inside the cell and their release is initiated in response to stimuli. An example of one of these proteins is insulin, insulin is released in response to rising blood glucose levels as an attempt to control blood glucose levels for homeostasis. 

One feature of petide hormones is that they are souble in water. This allows them to dissolve in blood plasma for transportation around the body. Due to the inability of peptide hormones to travel through plasma membranes of cells their receptors are found on the surface of cells[2].  

References

  1. The medical biochemistry page, http://themedicalbiochemistrypage.org/peptide-hormones.php#basics. [3/11/16]
  2. Boundless. “Lipid-Derived, Amino Acid-Derived, and Peptide Hormones.” Boundless Biology. Boundless, 26/05/16 https://www.boundless.com/biology/textbooks/boundless-biology-textbook/the-endocrine-system-37/types-of-hormones-210/lipid-derived-amino-acid-derived-and-peptide-hormones-793-12028/ [4/11/16]
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