Histology Flashcards
Descirbe the capillaries.
Endothelial cells: specialized epithelial cells that line blood vessels
Basal lamina: layer of extracellular matrix secreted by endothelial cells
Pericytes: contractile cells that wrap around the endothelium and allows capillaries to contract
Contrast the capillaries.
What are methods of capiallary exchange?
Open pores/gaps
Diffusion
Filtration
Vesicular Transport
Transendothelial channels
What are the endothelial cell functions for passage of compounds?
Adhesion molecules (ex. diapedesis)
Produces vasoactive compounds
Metabolic conversations
Conrast the three basic layers in arteries and veins.
Tunica intima: endothelium, connective tissue, IEL (internal elastic lamina)
Tunica media: (thicker in arteries), smooth msucle, elastic fibers, EEL (external elastic lamina)
Tunica Adventitia: (thicker in veins), connective tissue, vasa vasorum, nerves
Contrast the layers that distinguish arteries and veins in terms of the number of layers/thickness.
What are the types of microcirculation?
Arteriole - capillary bed - venule
Arteriovenus anastomasosis (ex: skin, when hot shunt closess off and when cold it opens)
Ateriole - capilliary - arteriole (kidney)
Venule - capillary - venule (liver)
What are the order of veins after a capillary?
Post capillary venule, collecting venule, muscular venule
Describe the lymphatic vessels.
Vavles, no tunica media, and there will be nucleated cells within them. Remember red blood cells do not have a nucleus, so if you see unnucleated cells it is most likely a vein not a lymph vessel.
Describe the layers of the heart.
Epicardium: connective tissue with adipose
Myocardium: Thick heart muscle
Endocardium: Purkinje fibers located in this area
