4- systemic circulation-the basic

Question 1

arteries always carry…

Answer 1

carry blood away from the heart

aka conducting arteries

Question 2

medium sized arteries are also called…

Answer 2

distributing arteries

Question 3

what part of the arteries affect BP

Answer 3

high elastin component of medium sized arteries dampen the BP from heart contractions

Question 4

medium sized arteries divide into

Answer 4

arterioles

Question 5

arterioles divide into

Answer 5

capillaries

Question 6

what occurs in the capillaries

Answer 6

substances exchange between blood and body tissues

Question 7

what do capillaries group together to form

Answer 7

venules

Question 8

how many erythrocytes pass through a capillary at a time

Answer 8

ONE

Question 9

venules merge to form

Answer 9

veins

Question 10

the role of veins is to

Answer 10

carry blood from tissues back to the heart

Question 11

what does vaso vasorum mean

Answer 11

vasculature of vessels

Question 12

where is the vascularity of blood vessels located

Answer 12

in the walls of larger blood vessels

Question 13

role of the vaso vasorum

Answer 13

supply oxygen and nutrient to larger blood vessels

Question 14

three layers of the artery wall

Answer 14

tunica interna
tunica media
tunica externa

Question 15

tunica interna

Answer 15

smooth surface, prevents friction

Question 16

tunica media

Answer 16

THICKEST, high elastic

smooth muscles, vasconstriction/dilation

Question 17

tunica externa

Answer 17

elastic and COLLAGEN fibers

protects vessels, anchors to surrounding structures

Question 18

what plays a key role in regulating blood flow into capillaries

Answer 18

arterioles (resistance vessles)

Question 19

change in what affects blood pressure

Answer 19

change in diameter

Question 20

capillaries are also called…

Answer 20

exchanging vessels

Question 21

what do capillaries do

Answer 21

connect arterioles and venules

allow exchange of nutrients and waste between blood and tissue cells

Question 22

where DO WE NOT find capillaries

Answer 22

avascular structures

lining epithelia, cornea, lens, cartilage

Question 23

whats special about capillaries structure

Answer 23

no tunica externa or media

Question 24

capillaries have low or high metabolic need

Answer 24

LOW metabolic need

Question 25

what happens to the capillary network with an increase in metabolic intensity

Answer 25

ENTIRE network fills w blood

Question 26

1 metarteriole supplies...

Answer 26

10-100 capillaries

Question 27

venules are union of several...

Answer 27

capillaries

Question 28

venule role

Answer 28

collect blood from several capillaries & drains into **Veins**

Question 29

venules dont have...

Answer 29

tunica externa

Question 30

veins cannot withstand

Answer 30

high pressure

Question 31

what helps venous return

Answer 31

pumping of the heart contraction of skeletal muscles in lower limbs valves found in veins

Question 32

what are venous valves

Answer 32

2 or more folds of tunica **interna** forming cusps projecting towards the heart

Question 33

leaky venous valves result in...

Answer 33

varicose veins

Question 34

veins/venules contains % of blood

Answer 34

60%

Question 35

capillaries contain % blood

Answer 35

5%

Question 36

arteries/arterioles contains % blood

Answer 36

15%

Question 37

20% of blood is always in the...

Answer 37

HEART