L12: blood and vascular tissue

Question 1

what is the outer fibrous sac of the heart called ?

Answer 1

pericardium

Question 2

what is the thickest layer of the heart that contains cardiac muscle cells ?

Answer 2

myocardium

Question 3

70% of total blood volume is in the ___

Answer 3

veins

Question 4

what are the 3 main layers of arteries ?

Answer 4

tunica intima
tunica media
tunica adventia

Question 5

what is present in the tunica intima layer of arteries?

Answer 5

internal elastic lamina
sub-endothelial CT
Endothelial

Question 6

what is present in the tunica media layer of arteries ?

Answer 6

smooth muscle

collagen and elastic fibers

Question 7

what is present in the tunica adventita layer of arteries ?

Answer 7

connective tissue

Question 8

what makes the structure of veins different from that of arteries?

Answer 8

tunica intima does NOT contain internal elastic lamina

tunica media is thinner

(difficult to tell apart the tunica intima and tunica media in veins )

tunica adventita is thicker

Question 9

what type of arteries is the largest ? ( ex: aorta )

Answer 9

elastic artery

Question 10

describe the structure of large elastic artery .

Answer 10

tunica media is thick (40-70 layers of elastic fiber and smooth muscle )

tunica advantatia is thinner , and vasa vasorum are plentiful

Question 11

what is vasa vasorum ?

Answer 11

small arteries that provide nutrients to outer tissue

Question 12

describe the structure of small arteries .

Answer 12

internal elastic lamina is clear while external elastic lamina is not distinguished

contains 3-9 layers of smooth muscle

Question 13

describe the structure of arterioles.

Answer 13

less than 0.5 mm in diameter , have similar structure to that of muscular arteries

Question 14

what do the cells of capillaries consist of?

Answer 14

thin tunica interna

Question 15

what cells stabilize the walls of capillaries?

Answer 15

pericytes

Question 16

what are fenestrated capillaries and where are they found ?

Answer 16

the endothelia contain a large number of pores such as kidney and glands.

Question 17

what are Discontinuous capillaries (sinusoids) and where are they found ?

Answer 17

consist of a large lumen and with discontinuous endothelia. They are found in the liver and spleen.