ch 20 pt 1

Question 1

Order of the blood vessels

Answer 1

Arteries -> Arterioles -> Capillaries -> Venules -> Veins

Question 2

What are the 3 layers of tunics?

Answer 2

Tunica intima, tunica media, tunica externa

Question 3

What is lumen?

Answer 3

Space inside of vessel

Question 4

What is tunica intima?

Answer 4

Innermost layer of vessel wall; simple squamous epithelium

Question 5

What is tunica media?

Answer 5

Middle layer; smooth muscle cells with elastic fibers

Question 6

Contraction causes vasoconstriction which

Answer 6

Narrows lumen

Question 7

Relaxation causes vasodilation which

Answer 7

Widens lumen

Question 8

What is tunica externa?

Answer 8

Outermost layer; areolar CT with elastic and collagen fibers

Question 9

What does tunica externa do?

Answer 9

Helps anchor vessel to other structures

Question 10

What is vasa vasorum?

Answer 10

Small arteries required to supply very large vessels

Question 11

What is companion vessels?

Answer 11

Arteries and veins serving same body region

Question 12

Why are arteries bigger than veins?

Answer 12

More resilient and resistant to changes in blood pressure

Question 13

What does capillaries do?

Answer 13

Rapid gas and nutrient exchange