12.2 Blood Vessels

Question 1

what is the difference between veins and arteries in terms of where they carry blood

Answer 1

arteries - away from heart

veins- towards heart

Question 2

what connects arteries and veins

Answer 2

capillaries

Question 3

what is the difference between veins and arteries in terms of they’re physical characteristics

Answer 3

arteries - thicker wall, 2 additional layers

veins - thicker lumen, disformed on slides

Question 4

why do arteries have thicker walls

Answer 4

cuz they experience more pressure

Question 5

what aids veins in the prevention of back flow

Answer 5

valves

Question 6

what are the three main layers of blood vessels

Answer 6

tunica interna - innermost layer
tunica media - middle layer
tunica externa - external layer

Question 7

what other layers are present in arteries but not veins?

Answer 7

elastica interna are present in the tunica interna

elastica externa are present in the tunica externa

Question 8

what sells make up the tunica interna

Answer 8

a layer of endothelial cells

Question 9

what muscle cells make up the tunica media

Answer 9

smooth muscles and elastic fibers running in a circular direction around the lumen

Question 10

what connective tissues make up the tunica externa

Answer 10

fibrous connective tissue and fat cells

Question 11

what is the function of the elastica externa

Answer 11

seperates the tunica media and tunica externa