Capillaries & Venous System Flashcards
(36 cards)
What blood vessel has very thin walls and is much finer than a human hair?
capillaries - they only allow red blood cells to pass thru the lumen in single file.
What blood vessel has very thin walls and is much finer than a human hair?
capillaries - they only allow red blood cells to pass thru the lumen in single file.
Capillaries are the smallest blood vessel and consist only of a tunica intima which is comprised of?
endothelium
What is the most common type of capillary?
continuous capillaries - found principally in skin & muscles.
What capillaries have pores or windows in their endothelium?
fenestrated capillaries - these allow for rapid entry & exit of nutrients & hormones.
What capillary is found principally in skin & muscle?
continuous capillaries
Which capillaries allow for rapid entry & exit of nutrients & hormones?
fenestrated capillaries - (looks a bit like swiss cheese)
Which capillaries are only found in highly specialised tissue such as bone marrow, the liver, spleen & adrenal medulla?
sinusoidal capillaries or sinusoids. they allow large molecules & even blood cells to pass between the blood and surrounding tissue.
Which capillaries are only found in highly specialised tissue such as bone marrow, the liver, spleen & adrenal medulla?
sinusoidal capillaries or sinusoids. they allow large molecules & even blood cells to pass between the blood and surrounding tissue.
Capillaries are the smallest blood vessel and consist only of a tunica intima which is comprised of?
endothelium
What is the most common type of capillary?
continuous capillaries - found principally in skin & muscles.
What capillaries have pores or windows in their endothelium?
fenestrated capillaries - these allow for rapid entry & exit of nutrients & hormones.
What capillary is found principally in skin & muscle?
continuous capillaries
Which capillaries allow for rapid entry & exit of nutrients & hormones?
fenestrated capillaries - (looks a bit like swiss cheese)
Which capillaries have large irregularly shaped lumens & are often fenestrated?
sinusoidal capillaries or sinusoids.
Which capillaries are only found in highly specialised tissue such as bone marrow, the liver, spleen & adrenal medulla?
sinusoidal capillaries or sinusoids. they allow large molecules & even blood cells to pass between the blood and surrounding tissue.
What is formed when capillaries unite?
venules (little veins).
What are the smallest venules called?
postcapillary venules - they consist entirely of endothelium and are very porous.
Venules join up to form ?
veins
Veins are much thinner than ……. as the blood flowing thru veins is under low pressure.
arteries
veins have ……. which prevent blood from flowing backward as it is pumped upward toward the heart.
valves
Which veins are located deep within muscle tissue in the body or limb?
deep veins - they usually have a corresponding artery alongside them. e.g. femoral vein is bside the femoral artery.
Which veins carry the vast majority of blood in the venous system?
deep veins
Which veins are closer to the surface of the body?
superficial veins - these veins do not have corresponding arteries.