Hormonal or enzymatic control of the alimentary tract, including control of acid and pancreatic secretion
Two secretory systems
- Two secretory systems, both under neural + endocrine + paracrine control:
- Gastric acid - parietal cell H+/K+ ATPase
- Pancreatic exocrine - ductal bicarbonate (secretin) + acinar enzymes (CCK, vagus)
- Three phases of digestion: cephalic (~30%, vagal), gastric (~50-60%, distension + peptides), intestinal (~10%, largely inhibitory)
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