BLOOD AND BLOOD VESSELS

Question 1

what do arteries do

Answer 1

carry blood away from the heart. all but one carry oxygenated blood

Question 2

what do arterioles do

Answer 2

control blood flow from arteries to capillaries

Question 3

what do capillaries do

Answer 3

link arterioles to venules and branch off from arteries to cells

Question 4

what are venules

Answer 4

control blood flow from capillaries to veins

Question 5

what are veins

Answer 5

carry blood to the heart
all but one carry deoxygenated blood

Question 6

what does larger cross section area of vessels mean

Answer 6

greater friction against blood
so slower flow

Question 7

describe arteries

Answer 7

thick muscular layer to control blood flow
thick elastic layer to maintain pressure]
stretches during systole
relaxes during diastole
no valves but 2 exceptions

Question 8

describe arterioles

Answer 8

thicker muscular layer
thinner elastic layer
no valves

Question 9

describe veins

Answer 9

thin muscle layer - carry blood back to the heart
thin elastic layer - lower pressure in them
valves to prevent backflow as veins have lower pressure

Question 10

describe capillaries

Answer 10

no muscle
no elastic layer
no valves
highly branches do have a large surface area
narrow lumen - can penetrate tissue to reduce diffusion pathway
endothelial lining has spaces so WBCs can move into tissue