Blood Vessels

Question 1

What are the components of the cardiovascular system?

Answer 1

Heart, blood vessels, blood

Question 2

Describe the features of arteries

Answer 2

1. Transports blood at high pressure
2. No valves
3. Thick muscular elastic walls
4. High velocity

Question 3

Which way does the arteries carry blood?

Answer 3

Carries oxygenated blood away from the heart to the organs

Question 4

What are the functions of arterioles?

Answer 4

Connectors between arteries and capillaries and are much smaller but similar to arteries

Question 5

Describe the features of capillaries

Answer 5

1. Site of gaseous and nutritional exchange
2. Thin walls
3. Very narrow lumen
4. Low blood pressure
5. No valves

Question 6

Which way do the capillaries move blood?

Answer 6

Moves both oxygenated and deoxygenated blood from the arteries to the veins.

Question 7

Describe the function and feature of venules

Answer 7

Thin wall, receives blood from capillaries

Question 8

Describe the features of the veins

Answer 8

1. Thin less muscular walls
2. Larger lumen
3. Low blood pressure
4. Valves

Question 9

Which way do the veins move blood?

Answer 9

Carry deoxygenated blood to the heart

Question 10

What are red blood cells referred to as?

Answer 10

Erythrocyte

Question 11

What is a pre capillary sphincter?

Answer 11

Ring of muscle that contracts and relaxes before the capillaries

Question 12

Describe the tunica externa

Answer 12

1.The outer region of the artery
2. Tough collagen resists overstretching

Question 13

Describe the tunica media

Answer 13

1. Middle region of the artery
2. Elastic smooth muscular layers
3. Contraction of smooth muscle regulates blood flow and maintains pressure

Question 14

Describe the tunica intima

Answer 14

1. Innermost region of the artery
2. Lined by a single layer of cells (endothelium) ; smooth to reduce friction normally on an internal elastic layer