GIT motility Flashcards
What are the stages of swallowing?
Voluntary stage
Pharyngeal stage
Oesphageal stage
What happens at the voluntary stage
Food bolus squeezed into pharynx by tongue
What happens at the pharyngeal stages
Pharyngeal mechanoreceptors swallowing receptors Somatic and parasympathetic nerves automatic pharyngeal contraction upper oesophageal sphincter relaxes
What motility happens at the oesphageal stage
primary peristalsis - food bolus in oesphagus
secondary peristalsis - oesophageal distension
what muscles are used at the oesophageal stage of swallowing
Striated muscle- upper 1/3 of oesophagus
Smooth muscle- lower 2/3 of oesophagus
What innervated the musculature of the oesophagus
Glossopharyngeal and vagus nerve
What happens when the food reaches the stomach
Lower oesophageal peristalsis
stomach relaxation
Opening lower of oesophageal sphincter
Where is HCL acid secreted from
Parietal cells from canaliculi
What is the usual gastric pH
1-3
