Topic 42 - Arteries

Question 1

What is elastic arteries?

Answer 1

aorta and primary branches, arteria pulmonalis. Contains large amount of elastic elements. Function as resistance vessels (for high blood pressure).

Question 2

Elastic arteries:

Tunica intima:

Answer 2

-endothel+subendo-thelial connective tissue

Question 3

Elastic arteris:

Tunica media:

Answer 3

30-70 layers of elastic membranes (fenestrated)+ SM (thickest layer)

Question 4

Elastic arteries:

Tunica adventitia:

Answer 4

Tunica adventitia: elongated collagen fiber bundles, loose elastic fibers, vasa vasorum, nervi vasculares

Question 5

What is muscular arteries?

Answer 5

medium to small caliber, with smooth muscle as dominating element in tunica media. Function as distributor vessels. Possess internal and external elastic membranes (between each of the tunica).

Question 6

Muscular arteries:

Tunica intima

Answer 6

similar to the one of elastic arteries

Question 7

Muscular arteries:

Tunica media

Answer 7

the thickest layer spiral smooth muscle cell layers +few elastic fibers

Question 8

Muscular arteries:

Tunica adventitia:

Answer 8

thinner than media. Longitudinally running collagen fibers, CT cells.

Question 9

What is a diseased arterie?

Answer 9

narrowed atrial wall due to poor diet (cholesterol), decreased diameter slows blood flow allowing clotting to occur, hypoxia occurs with complete blockage

Question 10

What is arterioles?

Answer 10

: 2-3 layers thick, lead into capillaries, controlled by sphincter.