neural and hormonal control n.
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Neural and hormonal control

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Neural and hormonal control

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  1. Neural and hormonal control

  2. Cephalic phase • Brain activated by smell, sight, thought, taste of food. • Neurons to salivary glands and gastric glands/stomach muscles • Autonomic nervous system

  3. Gastric phase • Stimulus: food in stomach • Neural: • Stretch receptors activated. Impulse to neurons in submucosa. Triggers: • gastric gland production and causes peristalsis. • Hormonal: • Food triggers release of gastrin (hormone). Goes in blood. Triggers: • gastric gland juices, • sphincter to prevent acid-reflux, • stomach muscles • relaxes lower stomach sphincter.

  4. Intestinal phase • Stimulus: food in intestines • Neural: stretch receptors to medulla oblongata. Sympathetic nerves to stomach cause: • decreased stomach movement and increase contraction of pyloric – bottom - sphincter (delays stomach emptying) • Hormonal: • Cholecystokinin (CCK): stimulates pancreatic juice/squeezes gallbladder