Term
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Definition
Branch into smaller & smaller 2 b arteriels
Hve capillary sphincter = wherether
If vasodilation takes place
If vasoconstriction takes place
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Term
Capillaries dont hve _______
b/c it would get in the way of diffusion |
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Definition
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Term
Walls of arteries & veins hve three layers called tunics. From outer to inner:
Tunics surround the _____ of the vessel
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Definition
Tunica externa
Tunica media
Tunica intima
"Lumen" or inside space |
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Term
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Definition
AKA(adventitia)
outer layer
Aerolar CT ~ Elastic & Collagen fibers anchor it 2 other organs
Vasa vasorum =filtrates wall of large vessels, runs thru this tunic
♥Requires its own supply of oxygen♥
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Term
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Definition
"Circularly arranged smooth muscles"
Deals w/ thermoregulation
Muscles dilate or constrict when warm or cold |
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Term
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Definition
(interna)
Composed of an endothelium
specifically:
Simple squamous epi
Underlying layer of Aeriolar CT (basement memb)
[image]Extensions of it forms the valves we see in veins[image] |
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Term
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Definition
Takes place in arterioles
Decreases blood flow into the capillaries
Increase Blood Pressure
Blood vessels move closer to interior
Reduces heat loss thru the skin
[image]
b/c person is COLD |
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Term
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Definition
Takes place in arterioles
Increases blood flow into the capillaries
Decreases Blood Pressure
b/c more space 4 Blood flow
Blood vessels move closer to exterior
Gets rid of excess heat
[image]
to cool u off |
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Term
| Vein _______ tunica media, than Arteries. |
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Definition
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Term
| Vein ________ tunica intima than arteries |
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Definition
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Term
| Arteries have ____ tunic intima than Veins. |
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Definition
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Term
| Arteries hve _______ tunica media than Veins |
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Definition
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Term
| Lumen in Arteries is _____ than in Veins |
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Definition
Narrower than vein lumen
b/c of thicker artery walls |
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Term
| Lumen in veins is _____ than in arteries |
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Definition
Wider than artery lumen
b/c of Thinner vein walls
Has collapsed appearance when cut in cross section |
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Term
????
Valves of heart r extensions of _______ layer |
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Definition
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Term
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Definition
Not soo many tunics
would get in way of diffusion
thin wall & narrow vessel diameter good 4 Diffusion
has a
Basement membrane
Tunica intima
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Term
Tunica intima
CPS
question |
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Definition
Only layer in capillaries
Continous w/ valves in veins
Continous w/ endocardium b/c it slides right on into the heart |
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Term
Tunica media
CPS question
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Definition
| Responsible 4 vasoconstriction /vasodilation |
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Term
Fetal circulation
list steps |
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Definition
No functioning lungs or liver soo has bypasses thru these organs
Ductus arteriosus
Aorta
Left ventricle
Left atrium
Foramen ovale
2 bypass lungs
Enters Right atrium
Empties into IVC (mix of oxy rich/poor B)
[b/c IVC carries oxy poor B]
Ductus venosus
2 bypass liver
Umbilicus
Umbilical vein (oxy rich blood)
Vessel that carries blood from the Placenta
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Term
| Umbilical vein becomes ___ in baby |
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Definition
Round ligament of liver
(ligamentum teres hepatis) |
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Term
| Umbilical arteries becomes ___ in baby |
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Definition
| Medial umbilical ligaments |
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Term
| Review Systematic & Pulmonary Circulation |
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Definition
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