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Blood Vessels (Classes (Arteries (Blood away from heart), Arterioles…
Blood Vessels
Classes
Arteries
Blood away from heart
Arterioles
Smaller arteries
Capillaries
Where diffusion occurs between blood and interstitial fluid
Venules
small blood vessels beginning the return of blood to heart
Veins
Blood to heart
Layers
Tunica Intima (Adventura)
Inner most layer
Endothelial lining
Underlying layer of connective tissues
Tunica Media
Middle layer
Concentric sheets of smooth muscle in a framework of loose connective tissue
Thickest layer (generally)
Tunica Externa
Outermost Layer of blood vessel
Sheath of connective tissue
Merges with tissue fibres of adjacent tissue stabilising blood vessel
Capillaries
Types
Continuous Capillaries
Location
Most of the Body
Endothelial Lining
Complete Lining
Function
Allows diffusion of
Water
Into Interstitial Fluid
Small solutes
Lipid-soluble materials
Prevents loss of blood cells and plasma proteins
Fenestrated Capillaries
Endothelial Lining
Contain windows or pores
Function
Allows rapid exchange of
Water
Into Interstitial Fluid
Larger Solutes (Lipids)
Examples
Choroid Plexus
Hypothalamus
Intestine
Capillary Beds
Anatomy
Interconnected Network
Several Direct connections between arterioles and venules
Collaterals
May receive blood from more than one artery
Fusion of which refered to as
Arterial anastomoses
Components
Precapillary Sphincter
Stops blood flow
Function
Insurance
Incase on vessel blocks