Capillaries

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1

Capillaries

only vessel that permits exchange due to its thin walls

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Capillaries

decreases blood diffusion distance

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Tunica Intima Endothelium in Capillaries

layer is 1 cell thick

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Continuous Capillaries

vessel bound by tight junctions, located in most places in body

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Continuous Capillaries

permit diffusion of: water, small solutes and lipid soluble materials

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Continuous Capillaries

prevent escape of blood cells and plasma proteins

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Fenestrated Capillaries

permits rapid exchange of water and solutes

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Porous

fenestrated capillary that permits rapid exchange of H2O and solutes

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Fenestrated capillaries

found where absorption and filtration need to be enhanced

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Sinusoidal capillaries

very specialized permit free exchange of fluid

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Sinusoidal cap bone marrow

brings RBC into blood and phagocytes stick cytoplasmic extension in to monitor RBC

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Sinusoidal cap spleen

monitors RBC

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Sinusoidal liver

plasma proteins into blood, monitors RBC

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Sinusoidal spleen and liver

monitors RBC

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Sinusoidal bone marrow

brings RBC into blood and phagocytes stick cytoplasmic extension in to monitor RBC

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cap bed

receive more than one artery (collaterals)

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lots of capillaries

1 arteriole gives rise to..

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Pre-capillary sphincters

blood flow regulated in cap bed

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Vasomotion

constant control of blood enter in cap bed

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Vasomotion

controlled by local changes O2 need

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Vasomotion

at rest 25% of total capillary bed volume is filled

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25%

percent total cap bed volume is filled always

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Arteriole

vessel that gives rise to capillary bed

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Collateral

receives more than one artery

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Capillary Tunica Intima Role

gas and nutrient exchange

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Porous

full of pores or vessels or holes, allowing passage in and out

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Kidney and Endocrine gland

place where absorption/filtration need to be enhanced

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Endocrine gland

a ductless gland that secretes hormones directly into the bloodstream

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Fenestrated

having a window or opening

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Spleen, Liver, Bone Marrow

sinusoidal capillary organs