endocrine glands
function
maintain function between cells , tissue and organs mediated by chemical material called hormone
control the different metabolic function of the body
act slowly and low concentration
delivary of secretion
endocrine
paracrine
autocrine
neurocrine
neuroendocrine
from synaptc terminal to control neuron neurotransmitter
pass to circulatory system
adjecent cells or diffuse to nearby target cells ECF action
regulate cell own activity
nerons has secrotory fencion DNECs RH from hypothalmus
characteristics
abundant vasculature and fenstated capillary with Extraordinary large diameter
well defined collection of hormone producing cells
ductless gland
scanty CT stroma in form of reticulat fibers
parenchma is arranged in columns(fasicles ),glomeruli , folliclaes and one group of cell facing the capillary
DNEs
homone producing cells scatterd in many organs and systems of the body with endocrine and paracrine fuction
sites
GIT
other
secrete GIT hormones control function of GIT havr basal secretory granules
stain with sliver stain so they called argentaffin cells
Gastrin G cells in pylorus
secretin S cells in intestinie
cholecystokinin I cells in small intestine
respiratory
heart
kidney
pulmonary neuroendocrie
atrial natrutic peptide
renin
pituitary
anterior
posterior
pars disatals
pars tubularis
pars intermidea
surrounded by thin c.t capsule mainly formed of endocrine cellsseprated by abundant fenestrated
2 types of cells
chromophiles 48%
chromphobes 52%
great affinity to stainin which hormones are stored in secretory granules
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