Blood Vessels

Question 1

What are our blood vessels made of?

Answer 1

3 layers called tunicas surrounding an open area called lumen

Question 2

Tunica adventitia

Answer 2

-outer layer
-made of strong connective tissue
-thicker than veins

Question 3

Tunica Media

Answer 3

-middle layer
-mostly smooth muscle
-thicker than arteries
-smooth muscles control dilation and constriction

Question 4

Tunica intima

Answer 4

-layer next to the lumen
-has smooth endothelium made of epithelial cells tightly packed for protection

Question 5

Arteries

Answer 5

-carry blood away from the heart

Question 6

Elastic arteries

Answer 6

-the includes the aorta
-can absorb pressure from blood being pumped and even the out flow.

Question 7

Arterioles

Answer 7

-smaller blood vessels that branch off from muscular arteries
-get smaller and smaller until they become capillaries

Question 8

Capillaries

Answer 8

-very thin walls (only a cell thick)
-this allows for exchange of oxygen and nutrients

Question 9

Venules

Answer 9

-returning blood is brought through venules
-become larger and larger until they become veins

Question 10

What are vein valves made of and what do they do?

Answer 10

-modified connective tissue
-helps keep the blood from flowing backward

Question 11

What has oxygenated blood?

Answer 11

pulmonary vein coming back to the left atrium from the lungs