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Chamberlain BIOS 255 CHAPTER 21 Exam Questions and Answers latest 2024/2025 100% Verified.
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Chamberlain BIOS 255 CHAPTER 21 Exam Questions and Answers latest 2024/2025 100% Verified.
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Chamberlain BIOS 255 CHAPTER 21tunica interna (intima) - ANS the innermost layer of a blood vessel, closest to lumen, direct
contact with blood. consist of inner endothelium and basement membrane.
tunica media - ANS The middle and thickest layer of tissue of a blood vessel wall, composed of
elastic tissue and smooth muscle cells that allow the vessel to expand or contract in response to
changes in blood pressure and tissue demand.
tunica externa - ANS outer layer of a blood vessel which connects it to surrounding tissues and
forms a protective layer.
Arteries - ANS carry blood away from the heart
functional properties of arteries - ANS elasticity- elastic tissue in tunica internal and media,
allows arteries to accept blood under pressure from contraction of ventricles
contractility- smooth muscle in tunica media, allows arteries to increase or decrease lumen size
and limit bleeding from wounds.
anastomosis - ANS anastomosis is the union of all pathways
- provide alternate routes for blood flow arteries that do not anastomose are known as end
arteries.
- if the end artery in a particular region of the body and narcosis can occur.
type of arteries - ANS Elastic arteries( conducting arteries)
- Large diameter, more elastic fibers, less smooth muscle, function as pressure reservoirs
Muscular arteries ( distributing arteries)
- Medium diameter, more smooth muscle, fewer elastic fibers, distribute blood to various parts of
the body.
Capillaries - ANS capillaries are microscopic vessels that connect arterioles and venules.
The primary function is the exchange of nutrients and wastes between the blood and tissue cells
through interstitial fluid.
composed of a single layer( endothelium) cells and a basement membrane.
three type of capillaries - ANS continuous - layered in the endothelium cell. located in fat,
muscle, and nervous systems.
fenestrated - holes for nutrients and gases to pass. located in endocrine glands, kidneys,
glomeruli
sinusoids - incomplete basement membrane. located in the liver, bone marrow, spleen
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