stages of digestion

Question 1

deglutition stages (swallowing)

Answer 1

1st buccal stage : Bolus move from oral cavity to oropharynx

2nd Paryngeal stage : Involuntary, bolus from orophrynx to esophagus

3rd Esophageal stage: Involuntary, bolus from esophagus to stomach

Question 2

esophagus sphincter

Answer 2

two, one at pharyngeal stage ( orophrynx to pharyngeal)

second at Gastroesophageal ( esophagus to stomach)

Question 3

Serosa (Stomach layer)

Answer 3

outer most layer,
made with simple squamous epithelium
it is smooth, slippery, thin, secrete watery fluid,