pancreas Flashcards
(14 cards)
pancreas has both __ and ___ glands
endocrine and exocrine
which gland constitutes 95% of pancreatic mass
exocrine
exocrine glands have two cell types
acinar and cenroacinar
have characteristics of protein secreting cells and are filled with zygomen granules in the apical region
acinar
form the initial portion of the intercalated duct that penetrates the acinar lumen
cenroacinar
secrete several pancreatic enzymes which are first secreted as proenzymes and the activated in small intestine
acinar
secret large quantities of enzyme poor alkaline fluid, which neutralized acidic chyme
the enzyme secretion is controlled by?
cenroacinar
cholecystokinin - secreted by secretin
secretin and cholecystokinin are produced by
enteroendocrine cells of the digestive tract
striated ducts are absent in pancreas
true
the endocrine part of the pancreas includes
lightly stained cells called islets of Langerhans
islets of langerhnas contain 3 cell types
alpha, beta, delta
alpha cells (20%) produce
glucagon that elevates blood glucose
beta cells (70%)
produce insulin that decreases blood glucose
delta cells (5%)
produce somatostatin that regulates the secretion of alpha and beta cells