Flashcards in Digestive System Deck (128)
Positions food during chewing, mixes food with saliva to form a bolus, initiates swallowing
What are the 3 salivary glands?
parotid gland, submandibular gland, and sublingual glands
What are the functions of the saliva?
cleanses mouth, dissolves food chemicals, moistens food, and begins chemical breakdown of starch
Between which 2 ages do teeth begin to erupt?
How many permanent teeth can one have?
What are the 4 classes of teeth? Amount upper L or R?
incisors (2), canines (1), premolars (2), and molars (3)
What are the 3 main parts of the teeth?
crown, neck, and root
Nasopharynx, Oropharynx, and laryngopharynx
Which organ is lined by the stratified squamous epithelium?
Which digestive processes occur in the mouth?
ingestion, mechanical breakdown, propulsion, and digestion
Which digestive process occur in the pharynx and esophagus?
How does mastication occur?
Cheeks and lips hold food between teeth, teeth cut and grind, and tongue from a bolus
How does deglutition occur?
tongue presses against hard palate and bolus is forced into oropharynx
Wha are the 2 phases in delglutition? voluntary?
Buccal phase- voluntary
Paryngeal-Esophageal Phase- Involuntary
What moves food through esophagus?
What are the functions of the stomach?
temporary food storage (50mL/4L), begins chemical breakdown of proteins, and converts bolus to chyme
What controls food entry into the duodenum?
What is the extra layer in the stomach?
In the stomach, where are gastric pits located?
How are gastric juices produces?
gastric pits lead into gastric glands
What are the 4 major cells types in the gastric gland?
mucous neck cells, parietal cells, chief cells, and enteroendocrine cells
Required for absorption of vitamin B12
mucous neck cells
Secretes HCl and intrinsic factor, activate pepsin
Protects stomach mucosa, created by thick layer of bicarbonate-rich mucus
In mechanical breakdown, bolus is converted into..?
In Digestion, what is the purpose of HCl and pepsin?
HCl- denatures proteins
Pepsin- begins digestion of proteins