Spikes 若-10 20 Slow waves Depolarization 30 40 Stimulation b 50 1. Norepinephrine -60 Resting Stimulation b 2. Sympathetics 1. Stretch 70 2. Acetylcholine 3. Parasympathetics Hyperolarization 0612182430364 248 54 Seconds
Normal Ber frequencies in the gastrointestinal system 3 cp 12c 108 Proximal jejunum 9.6 cpm Distal jejunum 8 Distal ileum Proximal ileum
Normal BER frequencies in the gastrointestinal system
Spike potential (Action potential) o Duration 10-20 ms o lonic mechanism Depolarization Caz+ influx Repolarization K efflux
◼ Spike potential (Action potential) Duration: 10~20 ms Ionic mechanism: ◼ Depolarization: Ca2+ influx ◼ Repolarization: K+ efflux
Action potentials E四 Threshold Slow waves potential Membrane depolarization Time c0 0E50080 Time
Neural control of gastrointestinal function(胃肠功能的神经调节 Enteric nervous system(intrinsic) Autonomic nervous system(extrinsic nervous control Enteric nervous control Paracrine control Gut cell Luminal contents control
Neural control of gastrointestinal function (胃肠功能的神经调节) ◼ Enteric nervous system (intrinsic) ◼ Autonomic nervous system (extrinsic)