Chapter 21 Blood Vessels

Question 1

Arteries carries blood where ?

Answer 1

away from the heart and into the tissues

Question 2

What are capillaries what are their size in comparison to the other two?

Answer 2

• smallest of the three

- site of exchange between blood and interstitial fluids

Question 3

Veins

Where do they travel?

Answer 3

• carry deoxygenated blood from the tissues back to the heart

Question 4

The vessel wall has how many layers of tissue?

Answer 4

3

Question 5

What are the three layers of tissue in the vessel walls?

Answer 5

Tunica intima
Tunica media
Tunica adventitia

Question 6

The inter most layer of the vessel wall.

Composed of simple epithelium with underlying connective tissue

Answer 6

Tunica Intima

Question 7

Middle Layer of of the vessel wall.
Composed of smooth muscle tissue.
The muscle dilates and constricts because of this layer.

Answer 7

Tunica Media

Question 8

The outermost layer of the vessel wall.

Composed up of fibrous connective tissue/ Collagen Fibers that anchor the vessel in place.

Answer 8

Tunica Externa

Question 9

Larger vessels have ___ ____ that provide nourishment to the cells of the vessel; located in the Tunica Externa.

Answer 9

Vasa Vasorum

Question 10

_____ and _____ are usually paired together.

Answer 10

Arteries and veins

Question 11

Between veins and arteries, which walls are much thicker than the other?

Answer 11

Artery walls are much thicker than vein walls.

Question 12

• hollow space of the veins an arteries

- allows more blood to pull in veins

Answer 12

Lumen

Question 13

Three types of arteries

Answer 13

Elastic Arteries
Muscular Arteries
Arterioles

Question 14

• largest artery in diameter
• most elastic ( stretch and recoil)
• Smooths out large pressure fluctuations by expanding and recording
• name two examples

Answer 14

Elastic Arteries

Examples - Aorta and Pulmonary trunk

Question 15

• Distributing Arteries
• Deliver Blood to organs
• Able to change in diameter
• name an example

Answer 15

Muscular Arteries

Example: Renal Arteries

Question 16

• Determine the flow to capillary bed

- Smallest arteries

Answer 16

Arterioles

Question 17

• Smallest blood vessels

- Thin walls of just tunica intima

Answer 17

Capillaries

Question 18

Capillaries

- Site of exchange between _____ and ______.

Answer 18

Blood and interstitial fluids

Question 19

Two types of Capillaries

Answer 19

Continuous

Fenestrated

Question 20

When classifying veins there are not many variations. The one main variation is what ?

Answer 20

Change in diameter

Question 21

List the veins smallest to largest and give an example.

Answer 21

Smallest veins are called - Venules
Medium veins are just - reg. veins
Largest veins are like the superior and inferior vena cava

Question 22

What are the valves for inside of the veins? Which veins have them>

Answer 22

The medium and small veins have them.
Valves
Ensures that blood flow goes in only one direction .

Question 23

Veins collect blood from where? Where does also go/ return?

Answer 23

Veins

• collect blood from all tissues and organs
• return it to the heart

Question 24

Veins have a _____ wall and a ______ lumen than arteries .

Answer 24

Veins

• Thinner wall
• Larger Lumen

Question 25

______ drain capillary bed

Answer 25

Venules

Question 26

Smaller veins have _______ to maintain the flow of blood towards the heart.

Answer 26

valves

Question 27

Three main types of blood vessels

Answer 27

arteries capillaries veind