Chapter 12

Question 1

cardiovascular system

Answer 1

heart, blood vessels, lungs

Question 2

blood vessels

Answer 2

• arteries
• veins
• capillaries

Question 3

Arteries

Answer 3

• carry blood Away from heart
• usually thicker than veins
• muscular

Question 4

veins

Answer 4

return blood to the heart

Question 5

capillaries

Answer 5

-sites of nutrient and gas exchange
(b/w blood and interstitial fluids, diffusion or pressure)
-microscopic

Question 6

blood circulation

Answer 6

heart > arteries > arteriole > capillary > venule > vein > heart

Question 7

Veins blood flow mechanisms

Answer 7

• gravity
• back flow valves
• contraction of skeletal muscle
• pressure changes