Veins & Venules

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created 8 years ago by chemistry_goo
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1

Venules

collect blood from cap beds

2

Venules

vessel may lack tunica media at small size

3

capacitance vessel

vein that expand easily (~8x arteries)
store blood

4

Vein

vessel has lower blood pressure and thinner walls

5

Veins

vessel has slender tunica media
(vasoconstriction if hemorrhaging)

6

Venous values

vein-folds of tunica intima

7

Venous values

found in venules and medium size veins of limbs

8

venules

smallest venous vessels

9

venous valve

compartmentalize blood in vein; resist weight of blood in section to prevent back flow

10

skeletal muscle

this helps by contracting to assist in venous return

11

Anastomoses

usually found in organs where blood supply is enormously important -heart/brain

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Anastomoses

interconnections between vessels to ensure a constant blood supply.

13

Arteriovenous

connecting an artery to a vein

14

Arteriovenous

vessel that bypasses blood straight to capillaries; sympathetic control

15

Venous reserve

located in liver skin and bone marrow; plays a role in blood distribution stores blood

16

venous reserve

stores 21% of blood in liver, skin, bone marrow

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20%

amount of blood stored in venous reserve for unexpected hemorrhaging

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tunica intima

cell layer that folds of venous valves occur

19

sympathetic control

type of control arteriovenous vessels use

20

Heart and Brain

organs anastomoses vessels are found

21

bone marrow, liver, and skin

organs that receive the most blood from venous reserve 21% in case of hemorrhaging