Chapter 18

Question 1

Lumen

Answer 1

an area filled with blood

Question 2

How many tunics do blood vessels have

Answer 2

3, tunica interna, tunica media, tunica externa

Question 3

Tunica interna

Answer 3

inner layer, made of simple squamous epithelium, with areolar connective tissue deep

Question 4

Tunica media

Answer 4

middle layer, made of smooth muscle and connective tissue (elastic and collagen fibers)

Question 5

Tunica externa

Answer 5

outer layer, made of collagen connective tissue

Question 6

What is the pressure and direction of arteries

Answer 6

high pressure, away from heart

Question 7

What tunic do arteries have

Answer 7

thick tunica media with increasing elastic tissue

Question 8

Lumen size of arteries

Answer 8

small

Question 9

How many types of arteries are there

Answer 9

3
1.) large, elastic, and conducting arteries
2.) medium, muscular, distributing arteries
3.) small, resistance arteries

Question 10

Describe large, elastic, and conducting arteries

Answer 10

large amounts of elastic tissue creates balloon-like shape to maintain pressure, the aorta and its major branches

Question 11

Describe medium, muscular, distributing arteries

Answer 11

higher percent of smooth muscle in tunica media, inner/outer elastic lamina on either side of smooth muscle, have ability to constrict allows blood to flow to different places

Question 12

Describe small, resistance arteries

Answer 12

no names, contains small arterioles that lead into capillaries

Question 13

What tunic do capillaries have

Answer 13

tunica internia

Question 14

Describe size of capillaries

Answer 14

short - 1mm in length, narrow - 1 rbc in diameter

Question 15

Pericyte

Answer 15

stem cell that repairs capillaries

Question 16

How many types of capillaries are there

Answer 16

3
continuous, fenestrated, discontinuous/sinusoidal

Question 17

Describe continuous capillaries, location, permeability

Answer 17

solid layer of closely connected endothelial cells, all over the body, least permeable

Question 18

Describe fenestrated capillaries, location, permeability

Answer 18

contains windows, found in intestines and kidneys, slightly permeable because of the small windows

Question 19

Describe discontinuous/sinusoidal capillaries, location, permeability

Answer 19

have gaps in endothelial cells, rare but found in spleen, bone marrow, liver, high permeability due to large spaces for cells to move in and out

Question 20

Pressure and direction of veins

Answer 20

low pressure, returning blood to heart

Question 21

Describe the walls and lumen of veins

Answer 21

thin, large

Question 22

How much blood do veins store

Answer 22

60%

Question 23

How many types of veins are there

Answer 23

3
post-capillary venule(s), small veins, large veins

Question 24

Post-capillary venule(s)

Answer 24

have gaps in walls where WBCs leave the blood

Question 25

Small veins

Answer 25

no names, some have valves

Question 26

Large veins

Answer 26

have names and valves