Blood vessel structure

Question 1

The blood vessel has 3 layers

Answer 1

1. Tunica interna (a.k.a. tunica intima
   Innermost layer
2. Tunica media
   The middle layer, smooth muscle, and elastic fibers
3. Tunica externa (a.k.a. tunica adventitia)
   - Outermost laye

Question 2

1. Tunica interna

Answer 2

Innermost layer

Question 3

2. Tunica media

Answer 3

Middle layer, smooth muscle and elastic fiber

Question 4

Tunica externa (a.k.a. tunica adventitia)

Answer 4

Outermost layer

Question 5

Arteries carry blood

Answer 5

away from the heart to the tissues

Question 6

The walls of arteries are____, which allows them to absorb the ____created by ____of the heart as they pump blood into the arteries

Answer 6

• elastic
• pressure
  ventricles

Question 7

Because of the smooth muscle in the tunica media,
arteries can regulate their

Answer 7

diameter

Question 8

Elastic arteries (conducting arteries)

Answer 8

• Large diameter
• More elastic fibers, less smooth muscle
• Function as pressure reservoirs

Question 9

Muscular arteries (distributing arteries)

Answer 9

• Medium diameter
• More smooth muscle, fewer elastic fibers
• Distribute blood to various parts of the body

Question 10

An anastomosis is the union of the

Answer 10

branches of 2 or more
arteries supplying the same region of the body

Question 11

Anastomosis is helpful in providing

Answer 11

alternate route for blood flow

Question 12

Arteries that do not form an anastomosis are called

Answer 12

“end arteries”

If an end artery is blocked, blood cannot get to that
particular region of the body and necrosis can occur