Chapter 21 Blood Vessels Flashcards Preview

Biology 224 Lecture > Chapter 21 Blood Vessels > Flashcards

Flashcards in Chapter 21 Blood Vessels Deck (34):
1

what are closed delivery systems that begins and ends at the heart?

blood vessels

2

what are dynamic structures that pulsate, constrict, relax and proliferate?

blood vessels

3

what works with the lymphatic system to circulate fluids?

blood vessels

4

what are the different types of blood vessels?

- arteries
- capillaries
- veins

5

which blood vessels carry blood away from the heart and branch repeatedly?

the arteries

6

arteries are oxygenated except for the what?

except for the pulmonary circulation and umbilical vessels of fetus

7

what are the smallest branches of arteries called?

arterioles

8

which of the blood vessels are a site of exchange of substances?

capillaries

9

which of the blood vessels are in direct contact with tissue cells and directly serve cellular needs?

capillaries

10

what are venules formed by?

when groups of capillaries unite

11

which type of blood vessels carry blood toward the heart?

veins

12

veins are deoxygenated except for the what?

pulmonary circulation and umbilical vessels of fetus

13

all blood vessels consist of a what?

lumen which is a central blood-containing space, surrounded by a wall

14

walls of all blood vessels have three layers, called tunics, except for the what?

capillaries

15

what are the layers of the vessel walls called?

- tunica intima (internal)
- tunica media
- tunica externa (adventitia)

16

what is the innermost layer of the blood vessels called and what is it made up of?

- tunica intima
- endothelium with basement membrane
- with internal elastic lamina in the artery (thin sheet of elastic fibers

17

what is the middle layer of the blood vessels called and what is it made up of?

- tunica media
- mostly circularly arranged smooth muscle
- with external elastic lamina in the artery (network of elastic fibers that can seperate

18

what is the outer most layer of the blood vessels called and what is it made up of?

- tunica adventitia
- loosely woven collagen fibers; connective tissue (protect and reinforce vessels)
- help anchor vessels to surrounding tissues

19

in larger blood vessels such as the aorta, the tunica externa contains tiny blood vessels called what and what do they do?

- vaso vasorum
- nourish external blood vessel wall

20

what are the capillaries' walls made up of?

endothelium with sparse basal lamina

21

what are the three groups arteries are divided into?

elastic arteries, muscular arteries, and arterioles based on size and function

22

elastic arteries are what kind of arteries and they help propel blood while ventricles are what?

- conducting arteries
- relaxing

23

among the arteries which has the largest diameter and has a low-resistance lumen?

elastic arteries: conducting arteries

24

elastic arteries have what kind of lumen?

low-resistance lumen

25

of the elastic arteries, elastin is found in all three tunics, but mostly in what?

tunica media

26

elastin arteries contain substantial smooth muscle, but inactive in what?

vasoconstriction

27

what are known as "simple elastic tubes"?

elastic arteries, contain more elastin than all other vessels

28

elastic arteries function as what?

pressure reservoirs

29

what are pressure reservoirs and what do they do?

aorta, pulmonary trunk, aorta's major initial branches (brachiocephalic, subclavian, common carotid, common iliac arteries) - conduct blood from heart to medium sized vessels

30

what are distributing arteries?

muscular arteries

31

which type of arteries have medium sized diameter that range from pinky-finger sized to pencil-lead size?

muscular arteries: distributing arteries

32

what do these muscular arteries: distributing arteries do?

deliver blood to specific body organs

33

which kind of arteries account for most of the named arteries we studied in class? (brachial, radial, femoral arteries)

muscular arteries: distributing arteries

34

which kind of arteries has the thickest tunica media?

muscular arteries: distributing arteries (more smooth muscle and fewer elastic fibers)