Chpt. 24: Digestive System

functions of the digestive system

1) digestion

2) absorption

3) elimination
4) immunity

what are some organs of the digestive system?

• mouth

• accessory organs (not part of tract, glands)

• mouth

• pharynx

• esophagus

• stomach

• small intestine

• large intestine

what are the tunics/layers of the digestive tract?

1) tunica mucosa: epithelium, CT, muscularis mucosa

2) tunica submucosa: blood vessels, nerves, glands

3) tunica muscularis externa: circular layer, longitudinal layer = smooth muscle

4) serosa/adventitia

what are salivary glands? (characteristics + function)

• produce saliva, make bolus

• 99% water, 0.5% mucus

• types:

  • parotid, submandibular, sublingual

what kind of epithelium lines the esophagus?

stratified squamos epithelium non-keratinized

what are the parts of the stomach?

what are the layers of stomach muscle?

1) muscularis externum

2) rugae (help unfold/expand volume in stomach)

what are the functions of the stomach?

• physical digestion, churning

• chemical digestions (papsin)

• converts food from bolus to chyme

• absorption

what is the gastric pit?

located in mucosa, grooves in the mucosa and have cells that produce acid/protein/mucus

label parts of the small intestine

what is the function of the small intestine?

• final steps of chemical digestion

• absorption of most nutrients

• feedback to stomach, stop chyme entering duodenum