pack 2- blood vessels

Question 1

name the 3 vessels

Answer 1

artery
vein
capillaries

Question 2

name the structures in the vessels

Answer 2

lumen
smooth muscle wall and elastic tissue
endothelium
collagen outer layer

Question 3

what do capillaries have

Answer 3

lumen and endothelium

Question 4

role of collagen

Answer 4

strengthen walls

Question 5

role of elastic fibres

Answer 5

allow for stretch and recoil

Question 6

role of smooth muscle

Answer 6

allow to constrict and dilate

Question 7

how does blood flow in the veins

Answer 7

contraction of skeletal muscles
SL valves

Question 8

describe arteries and how they are adapted

Answer 8

thick muscle wall to withstand high blood pressure
elasticity allow vessel to recoil and maintain high bp.
smooth endothelium reduces friction
narrow lumen maintain bp

Question 9

describe veins and how they are adapted

Answer 9

valves prevent backflow
smooth endothelium reduce friction
wide lumen reduce resistance

Question 10

describe capillaries and how they are adapted

Answer 10

wall is 1 cell thick- reduce diffusion distance
pores
narrow lumen 1 cell- slow blood flow allow time for exchange of substances