Blood vessels

Question 1

What is the inner layer of blood vessels?

Answer 1

Tunica intima

Question 2

What is the middle layer?

Answer 2

Tunica media

Question 3

What is the outer layer?

Answer 3

Tunica adventitia

Question 4

What does the intima consist of?

Answer 4

Single layer of endothelial cells.

Question 5

What does the endothelium do?

Answer 5

Secretes vasoactive products and is a barrier to plasma proteins

Question 6

What does the media consist of?

Answer 6

Collagen and elastin matrix

Question 7

What does the media layer do?

Answer 7

Provides mechanical strength, elasticity and contractility

Question 8

What is the adventitia like?

Answer 8

No distinct outer border

Question 9

What does the adventitia do?

Answer 9

tethers vessels loosely in place

Question 10

What is the small blood vessel network in the adventitia called?

Answer 10

Vaso vasorum which are responsible for nourishing the media

Question 11

What diameter are elastic arteries?

Answer 11

1-2 cm

Question 12

Examples of elastic arteries

Answer 12

aorta, pulmonary trunk, iliac arteries

Question 13

Diameter of conduit arteries?

Answer 13

0.1-1cm

Question 14

What does the media of conduit arteries contain?

Answer 14

More smooth muscle. Highly innervated

Question 15

Diameter of arterioles

Answer 15

less than 0.1cm

Question 16

What are the main resistance vessels?

Answer 16

Arterioles because of narrow lumen.

Question 17

Capillaries diameter?

Answer 17

0.004-0.007 cm

Question 18

What are walls of capillaries made of?

Answer 18

single layer of endothelial cells.