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What is the flow of blood, excluding the heart?
- Arteries
- Arterioles
- Capillaries
- Venules
- Veins
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Where does gas & nutrient exchange occur?
The capillaries. Gas exchange can occur here because capillaries are only one endothelial layer thick, making them thin enough for gas exchange to occur.
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What is a tunic?
A tunic, in laymen's terms, is a covering or a layer. A tunic is also used to describe the structure of arteries and veins.
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Describe the three tunicas of the arteries and veins.
- Tunica interna (intima)
- -Contains lining of simple squamous epithelium (endothelium), basement membrane, and layer of elastic tissue (internal elastic lamina).
- -The endothelium lines the entire cardiovascular system.
- -Normally, endothelium is the only tissue that contacts blood.
- Tunica Media
- -Thickest Layer
- -Middle Layer
- -Consists of elastic fibers and smooth muscle that extend circularly around the lumen.
- Tunica Externa
- -Outermost layer
- -Composed mainly of elastic and collagen fibers.
- -In muscular arteries, an external elastic lamina composed of elastic tissue separates the tunica externa from the tunica media.
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Which tunica layer contains endothelium (simple squamous epithelium)?
Tunica interna (intima)
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Which tunica layer contains smooth muscle?
Tunica Media
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Which tunica layer is the thickest?
Tunica Media
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Which tunica layer is composed mainly of elastic and collagen fibers?
Tunica Externa
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