Vessels

Question 1

Lumen

Answer 1

Central blood-containing space

Question 2

Three wall layers in arteries and veins

Answer 2

Tunica intima (slick surface to reduce friction)
Tunica media (muscle)
Tunica externa

Question 3

Capillaries

Answer 3

-microscopic blood vessels
-walls of thin tunica intima
-Not found in: cartilage, epithelia, cornea, lens of eye

Question 4

Tunica media is affected by

Answer 4

Sympathetic nervous system controlling vasoconstriction and vasodilation

Question 5

Vasa vasorum

Answer 5

delivers nutrients to cells making up the vessels

Question 6

Elastic arteries

Answer 6

-large thick walled arteries with elastin in all three tunics
-inactive in vasoconstriction
-aorta and its major branches
-expand and recoil as blood is ejected from the heart

Question 7

Muscular arteries

Answer 7

-distal to elastic arteries
-active in vasoconstriction
-deliver blood to body organs

Question 8

Arterioles

Answer 8

-smallest arteries
-lead to capillary beds

Question 9

Continuous capillaries

Answer 9

-found in skin and muscles
-tight junctions prevent things from getting through
-blood brain barrier

Question 10

Fenestrated capillaries

Answer 10

-has pores
-good for absorption

Question 11

Sinusoid capillaries

Answer 11

-blood flows slowly allowing for modification
-found only in liver, bone marrow, spleen, adrenal medulla
-macrophages in lining

Question 12

Capillary beds

Answer 12

-microcirculation: terminal arteriole -> metarteriole

Question 13

Veins

Answer 13

aka capacitance vessels: contain up to 65 percent of blood supply

Question 14

Venous valves

Answer 14

prevent backflow of blood

Question 15

Resistance

Answer 15

Varies inversely with the fourth power of the vessel radius

Question 16

Muscular pump

Answer 16

contraction of skeletal muscles that moves blood from extremities to heart