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Flashcards in Blood Vessels Deck (21):
1

Tunica Interna

innermost layer of arteries containing endothelium

2

Tunica Media

middle layer of arteries
smooth muscle maintains elasticity and contractility for vasoconstriction and vasodilation

3

Tunica Externa

Outer layer
primarily elastic and collagen fibers

4

Vasa Vasorum

supplies tunics with blood

5

Large sized Arteries

large thick walls near heart
tunica media has more elastic fibers and less smooth muscle
conducts blood from heat to medium sized arteries

6

Medium sized Arteries

delivers blood to specific organs

7

Arterioles

arteries that deliver blood to capillaries
regulate blood flow via vasocon/dilate

8

Capillaries

made of only tunica interna
exchange nutrients and wastes b/t blood and tissue
not in cornea, lense, epidermis, cartilage

9

Continuous Capillaries

complete endothelial lining
skeletal, smooth, CT, lung
permit diffusion of water, small solutes, lipid soluble
prevents loss of blood cells and plasma

10

Fenestrated Capillaries

oval shaped pores
rapid exchange of water and other substances in or out
kidney, villi of SI, ciliary process of eyes

11

Sinusoids
Sinusoidal Capillaries

gaps b/t adjacent endothelial cells that allow passage of blood cells
liver, spleen, bone marrow
monitored by phagocytes

12

Capillary Bed
Capillary Plexus

networks connecting arteriole to venule

13

Metarteriole

emerges from precapillary sphincter on arteriole, nourishes cap plexus, empties into venule

14

Precapillary Sphincter

control blood flow through true capillaries

15

Venules

receive blood from capillaries and merge into veins

16

Valves

thin folds of tunica interna
prevents backflood

17

Varicose Veins

caused by leaky valves
overloaded veins bulge out

18

Simple Diffusion

Molecules pass to area of less concentration

19

Vesicular Transport

enclose plasma in vesicles that enter endothelial cells of capillary wall

20

Bulk Flow

Mvmt of large numbers of molecules or solutes in same direction

21

Edema

filtration greatly exceeds reabsorption
increase interstitial fluid leads to swelling