Digestive System

The flashcards below were created by user Anonymous on FreezingBlue Flashcards.

  1. describe the composition of stomach mucosa
    mucous cells produce alkaline mucus where gastric glands within gastric pits secrete gastric juices containing intrinsic factor - which is needed to absorb vitamin B12
  2. describe the composition of gastric pits
    • gastric pits produce pepsinogens - protein digesting enzymes
    • parietal cells = produce HCL
    • entereoendocrine cells - produce gastrin hormone
  3. describe the composition of the small intestine
    • consists of a muscular tube from the pyoloric sphicter to the ileocecal valve which is suspended from the posterior abdominal wall by the mesentary
    • it is the site of nutrient absorption into blood
  4. describe the subdivisions of the stomach
    • duodenum
    • jejunum
    • illeum
    • where the large intestine meets the ileocecal valve
  5. chemical digestion in small intestine
    • includes enzyme produced by intestinal cells, pancreas
    • pancreatic ducts carry enzymes to duodenum which contains bile
    • made in liver and stored in gall bladder where it enters in the duodenum
  6. describe the absoprtion in small intestine
    • greater surface area for absorption of nutrients due to¬†
    • microvilli - tiny projections of plasma membrane.
    • villi - fingerlike projections of mucosa with capillaries
    • circular folds - folds o mucosa and submucosa
  7. describe the physiology of large intestine
    • larger in diameter, shorter length than small intestine
    • illeocecal valve to anus
    • expels indigestable food reside from the body (producing feces)
  8. colon
    • ascending colon includes digested food where it travels up R side of abdominal cavity.
    • transverse colon - travels across
    • descending colon - down L side
    • sigmoid colon - S-shaped, enters pelvis
  9. anus
    • external anal sphincter = skeletal muscle, voluntary control
    • internal anal sphincter - smooth muscle, involuntary
    • sphincters normally closed except during defecation
  10. Accessory Digestive Organs
    • includes teeth
    • salivary glands
    • pancreas
    • liver
    • gallbladder
  11. Teeth
    • 32 permanent teeth
    • classified anteriorly to posterior¬†
    • incisors
    • canines
    • premolars
    • molars
Card Set
Digestive System
cram before the test
Show Answers