Peptides your body makes every day
→ Insulin (51 amino acids), pancreas: lets cells take in glucose.
→ Glucagon (29), pancreas: raises blood sugar between meals.
→ Ghrelin (28), stomach: the hunger signal.
→ GLP-1 (30), gut: more insulin release and fullness after eating.
→ Oxytocin (9), made in the brain: labour contractions and milk release.
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Sources
Sources 📚
• OpenStax, Anatomy and Physiology 2e — Chapter 17, The Endocrine System
• Amino-acid counts: UniProt — INS, GCG (glucagon and GLP-1), GHRL (ghrelin), OXT (oxytocin)






