Circulatory System Flashcards
What type of cell lines the natural free surfaces of BV & the interior of the heart?
Endothelial
What heart wall layer is mostly closely associated w/ pericardium?
Epicardium
What is the cell that lies close to the endothelium, contains actin & myosin & has contractile ability?
Pericyte
What type of BV has a thin wall compared to its lumen?
Vein
What is the name of the membrane closely associated w/ tunica intima?
External Elastic Membrane
What do capillaries lack that artieries& veins possess in their walls?
Smooth muscles
What structure is located in the R-atrium?
SA node
What is the innermost layer of blood vessels?
Tunica intima
The release of what substance during clot formation stimulates smooth muscles in arteries to contract?
Thromboxane A2
A sinusoid is a type of what structure?
Capillary
What is the name for the small blood vessels in the walls of blood vessels?
Vasa Vasorum
What structure in the kidney contains fenestrated capillaries?
Glomerulus
What BV is heavily invested w/ elastic fibers?
Aorta
What type of capillary is simple an epithelial tube w/ no basal lamina?
Lymphatic
What layer of the heart wall contains the most cardiac muscle?
Myocardium
What layer of the vessel wall contains primary longitudinally arranged collagen fibers &nervivascularis?
Tunica Adventitia
Where is von Willebrand factor stored in the endothelial cell?
Weibel-palade bodies
What type of artery is the aorta?
Elastic Artery
What major BV has a poorly developed tunica media & a thick tunica adventitia rich in elastic fibers?
Vena Cava
What BV controls blood flow into a capillary?
Arteriole
What is the pacemaker of the heart?
SA node
Prominent inner & outer elastic membrane are criteria for what type of vessels?
Muscular Artery
What is the DCT that comprises the skeleton of the heart?
Annuli fibrosis
What type of BV is found in endocrine glans & tissues where absorption is occurring?
Fenestrated capillaries
What glycoprotein factor is part of the clotting mechanism?
Von Wilberbrand factor
What layer of the wall of a large vein is most prominent?
Tunica adventitia
What type of fiber is observed in abundance among the smooth muscle fibers of the tunica media of the aorta?
Elastic Fibers
What layer of the heart contains endothelium?
Endocardium
Sinusoidal capillaries are seen in the spleen, liver, & in what specific part of what other organ?
Adenohypophysis / ant. pituitary
What membrane is associated w/ tunica intima?
Internal Elastic Membrane
What type of BV has a thick wall compared to its lumen?
Artery
What type of tissue comprises the annuli fibrosi?
Connective tissue
In general, what do veins have that arteries don’t?
Valves
What chemical is released from nerve fibers that cause arterial constriction?
Norepinephrine
What layer of the artery wall is the thickest?
Tunica Media
In general, in large vessels, where are the vasa vasora located?
Tunica Adventitia
What type of cell lines the external surface of the heart?
Mesothelial
