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endothelial ce‖ ● processes -microⅶii-ike, finger-|iked ● plasmalemmal vesicle 160-70nm, constitute about 25-35% of total volume /transendothelial channel /function: transport/ large molecules and storage of membrane( for enlarge, enlongated, pore-formed and microvilli e Weibel-Palade body: rod-liked, 3um long, 0.1 0.3um in d, secrete factor Vlll related antigen e microtubule and microfilament
endothelial cell: processes –microvilli-like, finger-liked plasmalemmal vesicle /60-70nm, constitute about 25-35% of total volume /transendothelial channel /function: transport large molecules and storage of membrane( for enlarge, enlongated, pore-formed and microvilli) Weibel-Palade body: rod-liked, 3um long, 0.1- 0.3um in D, secrete factor VIII related antigen microtubule and microfilament
EM classification ① Continuous capillary! Structural feature e endothelial cel‖ -more plasmalemmal vesIcles tight junction ● basal lamina: complete Distribution CT, MT, lung and CNs
EM: classification ①Continuous capillary: ---Structural feature: endothelial cell: -more plasmalemmal vesicles -tight junction basal lamina: complete ---Distribution: CT, MT, lung and CNS
2 Fenestrated capillary Structural feature eendothelial cell: -have fenestrae or pore(60-80nm in D, with 4-6 nm diaphragm) e basal lamina complete -Distribution: gastrointestinal tract, endocrine gland and renal glomerulus
② Fenestrated capillary ---Structural feature: endothelial cell: -have fenestrae or pore(60-80nm in D, with 4-6 nm diaphragm) basal lamina: complete ---Distribution: gastrointestinal tract, endocrine gland and renal glomerulus