lecture 6

Question 1

what are the three layers of the blood vessels

Answer 1

tunica interna, tunica media and tunica adventitia

Question 2

what are the three layers of the tunica interna

Answer 2

endothelium, subendothelium, internal elastic lamina (IEL)

Question 3

describe the subendothelium

Answer 3

a sparse pad of loose FCT which cushions the endothelium

Question 4

what does the endothelia do

Answer 4

lines the lumen of all blood vessels, and prevents blood from coagulating by touching connective tissues

Question 5

describe the internal elastic lamina

Answer 5

• a condensed sheet of elastic tissue that partitions the intima from the media. this layer of more pronounced in arteries than in veins

Question 6

describe the tunica media

Answer 6

unstriated smooth muscle that is under ANS control, its smooth muscle surrounded by connective tissue the amount of which varies with blood vessel needs, the thickness of the media is proportional to both blood pressure and vessel diamter

Question 7

in the tunica media what is the thickness directly proportion to

Answer 7

the blood pressure of the vessel and the vessel diameter

Question 8

describe the tunica adventitia

Answer 8

outermost layer, Loose FCT with a high content of collagen and a variable amount of elastin. lymphatics and ANS nerves are found in this region

Question 9

where are the vasa vasorum find

Answer 9

these are the blood vessels for the blood vessels. found in the tunica media and adventitia as they are too far from the flow of blood to get efficient nutrients by diffusion.

Question 10

whats a neurovascular junction

Answer 10

Artery, lymphatic, nerve, vein

Question 11

composition of an elastic artery vs a muscular artery

Answer 11

elastic more elastin within the tunica media, additional layers of elastic tissues in the smooth muscle cells.
Muscular has fine strands of elastin in the muscle bit.

Question 12

where may we find a elastic artery and a muscular artery

Answer 12

elastic may be the thoracic artery and a muscular may be the femoral artery

Question 13

function of elastic artery

Answer 13

The pressure in the aorta is very variable due to the pumping of the heart, so the pressure is pulsatile. We don’t want pulsatile in the capillaries. We change this by making more arteries elastic. During systole blood is put into arteries and they stretch, but then in diastole they retract. This reduces the pulsatile pressure in the lumen.
basically reduces pulsatility

Question 14

function of a muscular artery

Answer 14

to deliever the blood in a more even flow to where needed. so lots of muscle to help efficient blood flow in any condition

Question 15

what layer of the vein is thickest

Answer 15

the tunica adventitia

Question 16

what does the thick adventitia mean for the veins

Answer 16

means it can act as a capacitance vessel which means they can take up extra volume

Question 17

what is varicose veins

Answer 17

when the walls of the veins enlarge, so the blood gets stuck in the vein so the veins dilate and become visible

Question 18

why does venous capacitance matter

Answer 18

so more blood can pass through veins under the same pressure and veins can act as a store

Question 19

example of an elastic artery

Answer 19

thoracic artery

Question 20

example of a muscular artery

Answer 20

femoral artery