Related Experiment Videos
Pressure and length adaptations in isolated cat stomach
The American Journal of Physiology
|January 1, 1987
Summary
Gastric pressure and muscle tension adapt in triphasic patterns during stomach filling and emptying. This adaptation is primarily controlled by tonic cholinergic neurosecretion, not neural signals.
Area of Science:
- Gastroenterology
- Physiology
- Muscle Biology
Background:
- The stomach's ability to accommodate volume changes is crucial for digestion.
- Understanding the mechanisms of gastric pressure and muscle tension adaptation is key to comprehending gastric function.
Purpose of the Study:
- To investigate the correlation between gastric pressure adaptation and longitudinal muscle tension in isolated cat stomachs.
- To elucidate the role of neural and chemical factors in gastric mechanotransduction.
Main Methods:
- Isolated cat stomachs were filled with physiological solution.
- Longitudinal muscle strips from different gastric segments were analyzed for length changes and tension generation.
- Pharmacological agents (KCl, carbachol, physostigmine, atropine, tetrodotoxin) were used to probe neural and chemical influences.
Main Results:
- Gastric volume changes induced triphasic pressure changes (peak, accommodation, nadir, recovery).
- Longitudinal muscle strips exhibited triphasic tension adaptation and recovery, mirroring pressure changes.
- Proximal greater curvature strips showed the greatest tension responses.
- Cholinergic agents (carbachol, physostigmine) enhanced tension, while atropine reduced it; tetrodotoxin had no effect.
Conclusions:
- Gastric pressure and muscle tension exhibit parallel triphasic adaptations.
- Tonic cholinergic neurosecretion maintains baseline gastric tension.
- Gastric tension adaptations are regulated intrinsically and do not require ongoing neural control.