Blood Vessel Tunics

Question 1

(): hollow, inside space of blood vessel

Answer 1

Lumen

Question 2

Blood Vessel Walls
• Tunica () (adventitia)
• Tunica ()
• Tunica ()

Answer 2

externa, media, intima

Question 3

Capillaries
• () only
• Thin layer of “basement membrane” () covering

Answer 3

Endothelium

outer

Question 4

Tunica () (adventitia)
• Outermost layer of wall
• Composed mostly of loose () fibers
that protect and reinforce wall and anchor
it to surrounding structures

Answer 4

externa

collagen

Question 5

Tunica ()
• Middle layer composed mostly of smooth
muscle and elastin
• Vasoconstriction: decreased lumen diameter
• (): increased lumen diameter
• Responsible for maintaining blood flow and
blood pressure

• () fibers innervate this layer

Answer 5

media
Vasodilation
Sympathetic

Question 6

• Tunica () (Endothelium)
• Innermost layer that is in contact with blood
• Simple () epithelium
• Slick surface reduces friction

Answer 6

intima

squamous

Question 7

: Transport nutrient-rich blood
• Work with lymphatic system to circulate fluids

Answer 7

Blood vessels

Question 8

(): carry blood away from heart
• () except for pulmonary circulation and
umbilical vessels of fetus

Answer 8

Arteries

Oxygenated

Question 9

(): direct contact with tissue cells
• Function in gas exchange (O2/CO2)

Answer 9

Capillaries

Question 10

(): carry blood toward heart
• () except for pulmonary circulation and
umbilical vessels of fetu

Answer 10

Veins

Deoxygenated