Stomach

Where is Stomach located?

underneath the diaphragm

the Stomach is a site for…

where food is churned into chyme

Chyme

bolus mixes with gastric juice 

What does the Stomach secrete? 

Pepsin, which begins protein digestion 

How long does food remain in the Stomach?

approximately 4 hours

What are the regions of the Stomach? 

Cardial part, Fundus, body, & Pyloric part 

How are the muscle layers arranged in the stomach to aid in digestion?

Circularly, Longitudinally, & Obliquely

Pyloric Sphincter 

regulates the passage of chyme into the small intestine, specifically the duodenum. 

What are the three phrases of digestive processes in the Stomach?

Cephalic, Gastric, & Intestinal Phase

What is Cephalic Phase initiated by?

sight, taste, aroma, or thought of food

Where do the Cephalic phase inputs come from? 

Olfactory receptors & taste buds 

Gastric Phase

Stomach distension activates the stretch receptors

What activate cells in the Gastric phase in the stomach?

Food chemicals (peptides, rising pH)

Intestinal Phase 

presence of low pH & partially digested food in the duodenum stimulates intestinal gastrin secretion. 

Low pH

Acidic

High pH

Basic

Where does the peristaltic wave becomes stronger? 

Pyloric region 

What does the Pyloric Sphincter allow?

3mL of chyme passes to the duodenum &

Rest returns to the stomach for further digestion.