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
