E4 Ch. 20 Flashcards Preview

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Flashcards in E4 Ch. 20 Deck (52)
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1

list the 3 major types of blood vessels

arteries, capillaries, and veins

2

arteries

carry blood away from heart

3

arterioles

smallest arteries

4

capillaries

smallest blood vessels

5

venules

receive blood from capillaries

6

veins

receive blood from venules

7

name the 3 tunics that comprise blood vessels

tunic intima, tunica, media, and tunica externa

8

what is the tunic intima made up of

contains endothelium and subendothelial layer

9

purpose of the tunica media

sheets of smooth muscle, responsible for contraction (vasoconstriction) and relaxation (vasodilation)

10

lumen

central blood-filled space of a vessel

11

what are the different types of arteries

elastic, muscular (distributing), and arterioles,

12

describe elastic arteries

largest, diameter 2.5-1 cm, sometimes called conducting arteries

13

what structures are elastic arteries

aorta and its major branches

14

function of elastic arteries

high elastin content dampens surge of blood pressure

15

describe some features of muscular arteries

lies distal to elastic arteries, diameter 1cm- 0.3mm, thick tunica media, has internal and external elastic laminae

16

what are some features of arterioles

smallest arteries, dameter 0.3mm -10um, possess all 3 tunics,

17

what controls the diameter of arterioles

local factors in tissues, sympathetic NS

18

what is the site specific function of capillaries in the lungs

oxygen enters blood, carbon dioxide leaves

19

what is the site specific function of capillaries in the small intestines

receive digested nutrients

20

what is the site specific function of capillaries in the endocrine glands

pick up hormones

21

what is the site specific function of capillaries in the kidneys

remove of nitrogenous wastes

22

intercellular clefts

gaps of unjoined membranes, allow small molecules in and out of capillaries

23

what is the most common type of capillary

continuous capillaries, occur in most organs, least permeable

24

describe fenestrated capillaries

joined by tight junctions and desmosomes, have pores in endothelium

25

where do fenestrated capillaries mostly occur

areas where high rates of exchange occur; intestines, glomeruli of kidneys, and endocrine glands

26

list the different types of capillaries

continuous, fenestrated, and sinusoids

27

describe sinusoid capillaries

wide, leaky found in some organs, usually fenestrated, intercellular clefts wide open

28

where do sinusoid capillaries typically occur

bone marrow, and spleen

29

what are the 4 different routes in and out of capillaries (permeability)

direct diffusion, though intercellular clefts, cytoplasmic vesicles, and fenestrations

30

what is an example of low-permeability capillaries

blood brain barrier; have complete tight junctions, only vial molecules pas through