Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
3 major types of blood vessels
|
1. arteries
2. capillaries 3. veins |
|
|
Arteries
|
blood vessels that carry blood away from the heart
|
|
|
veins
|
blood vessels that carry blood back to the heart
|
|
|
lumen
|
center of blood vessels that holds the blood
|
|
|
3 tunics of blood vessels
|
1. tunica intima - innermost
2. tunica media - middle 3. tunica externa - outside |
|
|
tunica intima
|
endothelium; simple squamous epithelium that lines the lumen
|
|
|
tunica media
|
thickest layer; made of circular smooth muscle tissue and slastin regulated by the sympathetic nervous stem
|
|
|
vasoconstriction
|
reduction in lumen diameter as the smooth muscle contracts
|
|
|
vasodilation
|
increase in lumen diameter as the smooth muscle relaxes
|
|
|
tunica externa
|
woven collagen fibers that protect and reinforce the vessels and hold them in place; has nerve fibers, lymphatic vessels, elastin fibers
|
|
|
vasa vasorum
|
in larger blood vessels, smaller vessels that nourish the outer large vessel
|
|
|
elastic arteries
|
thick walled arteries near the heart; Aorta and its major branches; conducting arteries because of their large size and relatively no friction
|
|
|
capillaries
|
smallest blood vessels
|
|
|
3 types of capillaries
|
1. continuous
2. fenestrated 3. sinusoidal |
|
|
continuous capillaries
|
most common
|
