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FHDT
6 - Blood vessels and lymphatics
12
Anatomy
Kindergarten
01/16/2013

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Cards

Term
What is the diameter of a RBC and capillary?
Definition
-about 7μm and 14μm
Term
What cell type are endothelial cells and what specialized organelles do they contain?
Definition
-They are flat polygonal
-They have Weibel-Palse bodies which store von Willebrand factor
Term
What is a marginal fold in endothelium?
Definition
-When opposing corners of the squamous cells of capillaries overlap with one end protruding into the lumen
Term
What is the name for the internal and external surfaces of the endothelium?
Definition
-luminal and abluminal surfaces
-abluminal surface makes the basement membrane
Term
What are the three layers of the basement membrane?
Definition
-Lamina lucida, densa, and fibroreticularis
Term
What are pericytes? Other name?
Definition
-Pericytes, or Rouget cells, clasp the capillary walls and function in wound healing by becoming fibroblasts
-Fibroblasts make scar tissue and smooth muscle
Term
Where do we find continuous thick capillaries? How thick are the cells?
Definition
-In muscle tissue and parts of ovaries and testes
-The endothelial cells are 200nm thick and are united by desmosomes and gap junctions
-They use micropinocytotic vesicles for transport
-Surrounded by complete basement membrane
Term
What is the function of thin continuous capillaries? What are two distinguishing features of them?
Definition
-serves as blood-tissue barrier selecting only certain sized molecules to enter or exit capillaries
-They have zona occludens (tight junctions)
-Absence of micropinocytosis vesicles
-They are 100nm thick
Term
Give three examples of blood-tissue barriers?
Definition
-Blood-brain, blood-thymus, blood-ganglion
Term
Where do we find fenestrated capillaries with diaphragms and what is the purpose?
Definition
-They are for rapid fluid exchange
-Choroid plexus, ciliary body, kidney peritubular plexus
Term
-Where do we find fenestrated capillaries without diaphragms?
Definition
-In renal glomeruli
-Have very thick basement membranes
Term
What are sinusoids and where can we find them?
Definition
-They are modified to retain large quantities of blood under low pressure
-Have sparse or absent basement membranes
-Can find them in the liver, bone marrow, in sympathetic ganglia, and elsewhere
-They have fenestrae are open and variable sized
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