3.2

Question 1

What are the elastic membranes on either side of the tunica media of blood vessels called? Do arteries have them? Do veins have them?

Answer 1

• Internal/external elastic laminae
• Arteries have them
• Veins do not

Question 2

What are the wavy lines in the tunica media of arteries called?

Answer 2

Elastic laminae (more prominent in elastic arteries)

Question 3

Do veins or arteries have smooth muscle in their tunica adventitia?

Answer 3

Veins

Question 4

What type of fibres is most prominent in the tunica adventita?

Answer 4

Collagen fibres

Question 5

Elastic vs muscular arteries

Answer 5

Elastic: more elastic laminae in tunica media
Muscular: more smooth muscle in tunica media

Question 6

Where are the vasa vasorum located in elastic and muscular arteries?

Answer 6

Tunica Adventitia

Question 7

Describe the tunica intima of venules

Answer 7

Only endothelium

Question 7

Function of elastic vs muscular arteries

Answer 7

Elastic: maintaining relatively constant blood pressure (windkessel effect)

Muscular: efficiently transporting high-pressure blood away from the heart

Question 8

Adventitia of artery vs vein

Answer 8

Vein: thicker
Artery: thinner

Question 9

Pressure of artery vs vein

Answer 9

Artery: higher
Vein: lower

Question 10

Where is more blood located in the body: arteries or veins?

Answer 10

Veins -> lower pressure, slower, more time