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Flashcards in Chapter 21 Deck (52)
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1

5 general classes of blood vessels

1. arteries
2. arterioles
3. capillaries
4. venules
5. veins

2

arteries

carry blood aways from heart

3

arterioles

smaller branches of arteries found in tissues

4

venules

smaller veins

5

veins

larger vessels that carry blood toward heart

6

where is all the blood located in the body?
-answer
-total blood volume in venous system

-blood is unevenly distributed among blood vessel
- ~70%

7

systemic venous system
-3 things

1. venules and medium-sized veins (25%)
2. large venous networks (liver, bone marrow, skin) (21%)
3. large veins (18%)

8

pulmonary circuit
-total percent
-3 things

-9%
-1. pulmonary arteries (3%)
2. pulmonary capillaries (2%)
3. pulmonary veins (4%)

9

Heart
-percentage of blood

-7%

10

systematic arterial system
-percent
-4 things

-13%
-1. aorta (2%)
2. elastic arteries (4%)
3. muscular arteries (5%)
4. arterioles (2%)

11

systematic capillaries
-percent

7%

12

3 types of veins

1. large vein
2. medium sized vein
3. venule

13

2 types of capillary

1. fenestrated
2. continuous

14

large vein

superior and inferior vena cava

15

venule

collect blood from capillary

16

fenestrated capillary

pores penetrate endothelium

17

continuous capillary

endothelium is complete

18

3 types of arteries

1. elastic artery
2. muscular artery
3. arterioles

19

elastic arteries
-known as
-function

-conducting arteries
-transport large volumes of blood away from heart

20

muscular artery

distribution arteries

21

capillaries
-definition
-what do they function as
-high tissue demand for O2
-low tissue demand for O2

-only blood vessels that permit exchange between blood and surrounding
-an interconnected network - capillary bed
-precapillary sphincter opens
-precapillary sphincter closes

22

precapillary sphincter opens
-what does this allow

allows more blood flow through capillary bed

23

precapillary sphincter closes
-what does this allow

less blood flow through capillary bed

24

what is at the entrance to the capillary

band of smooth muscle

25

structure of blood vessels
-3 distinct layers

1. tunica intima
2. tunica media
3. tunica externa

26

tunica intima
-layer
-type of tissue

-innermost layer
-squamous epithelium = endothelium
-layer of connective tissue (areolar and elastic)

27

tunica media
-layer
-2 features

-middle layer
-layers of smooth muscle -allows vessel diameter to change
-supplied by ANS

28

Tunica externa
-2 features

-outer most layer
-connective tissue

29

vessel: artery
-endothelium (tunica intima)
-areolar/elastic tissue (tunica intima)
-tunica media
-tunica externa

-yes
-yes
-yes (large and thick)
-yes

30

vessel: arteriole
-endothelium (tunica intima)
-areolar/elastic tissue (tunica intima)
-tunica media
-tunica externa

-yes
-yes
-yes (less elastic tissue, more smooth muscle)
-yes