General Anatomy of Blood Vessels

38 cards

the circulatory system including blood vessels, capillaries, and veins


 
  
Created Feb 4, 2009
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pdb

 

 
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1
three principle categories of blood vessels
 
arteries, veins & capillaries
2
arteries
 
efferent vessels- carry blood away from heart
3
veins
 
afferent vessels- carry blood back to heart
4
capillaries
 
microscopic, thin walled vessels that connect the smallest arteries to teh smallest veins
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walls of arteries are composed of 3 layers of
 
tunics
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tunica interna
 
lines inside of the vessel- exposed to blood- consists of simple squamos epith called endothelium
7
tunica media
 
mid layer- thickest-smooth muscle, collagen,elastic tiss- strengthen the vess and prevent bp...
8
vasomotion
 
changes in diameter of a blood vessel
9
tunica externa
 
outer most layer- loose connect tiss often merges w. neigh vess anchors the vess and provides...
10
vasa vasorum
 
small vessels that supply blood to at least the outer half of the wall of a larger vessel
11
resistance vessles
 
a.k.a arteries. bc relatively strong resilient tiss struct that resists high bp- constructed...
12
conducting ( elastic or large) arteries
 
BIGGEST-expand during ventricular systole to receive blood& recoil during diastole.sub to highest...
13
Distributing (muscular or medium) arteries
 
smaller branches that distrib blood to specif organs- interestate highway- 40 layers of smooth...
14
resistance ( small) arteries
 
too variable in # and location to be given individual names- 25 layers of smooth musc & relatively...
15
arterioles
 
smallest of the resistance arteries 40-200Mm w/ only one to 3 layers of smooth muscle
16
metarterioles
 
short vessels that link arterioles and capillaries. have individual muscle cells spaced a short...
17
precapillary sphincter
 
encircles entrace to 1 capillary. constrict. shuts off blood flow through their respect cap&diverts...
18
cartoid sinuses
 
baroreceptors(press sensors) respond to changes in bp- wall of intern carotid artery- monitor...
19
carotid bodies
 
oval recept-3x5mm-sensory fivers of vagus&gloss nerves-monitor blood CO2 O2 and PH
20
aortic bodies
 
one to three chemorecptors located in oartic arch near arteries in head & arms- monitor blood...
21
blood capillaries
 
composed of only an endothelium & bment memb-walls .2-.4 mm
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where are capillaries scarce?
 
tendons & ligaments & absent from epithelia, cornea, and lens, and most cartilage
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3 types of capillaries
 
continuous, fenestrated, sinusoids
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continuous capillaries
 
occur in most tissues- enothelial cells-tight juncts-uninterrupted tube- exhibit pericytes
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fenestrated capillaries
 
filtration pores-allow for rapid passage of molecs butretain blood cells & platelets in bstream-kidnesys,endoglands,small...
26
sinusoids
 
irregular, highly porous blood spaces in such tissues as liver, spleen& b. marrow-twisted-conform...
27
pericytes
 
lie external to endothelium- contractile proteins- diff into endothelial & smooth mesc cells...
28
capillary beds
 
capillaries organized into these networks- 10 to 100 caps/metarteriole. they continue > thoroughfare...
29
thoroughfare channel
 
leads directly to a venule
30
capacitance vessles
 
a.k.a veins- thin walled & flaccid-exp easily to accom an inc vol of blood- greater capactiy...
31
smaller veins are calledexih
 
tributaries
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postcapillary venules
 
smallest veins-exch fluid with the tissues- very porous
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muscular venules
 
receive blood from postcap venules- up to 1mm in diam- have tunica media of 1 or 2 layers...
34
medium veins
 
up to 10mm-most veins w. individ names-exhibit infoldings of tunica interna to meet in midd...
35
varicose veins
 
failure of venous valves- ppl who stand long time-obesity and preg can promote- press on large...
36
varicose veins of anal canal
 
hemorrhoids
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venous sinuses
 
veins w. esp thin walls, large lumens, and no smooth musc- ex. coronary sinus of heart- NOT...
38
large veins
 
greater than 10mm- venae cavae, pulmon veins, internal jug, renal veins

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