Ap Ii: Bl Ii: 2: Ch 21 Blood Vessels

Front 1

Arteries carry blood to or away from the heart?

Back 1

away from

Front 2

The wall of an artery contains a tunica _____, a tunica _____, and a tunica _____

Back 2

interna, media, externa; IME

Front 3

The tunia _____ maintains elasticity and contractility

Back 3

media

Front 4

Large arteries are termed _____ (conducting), and medium sized arteries are called ______(distributing)

Back 4

elastic; muscular

Front 5

Many arteries ________, where the distal ends of two or more vessels unite

Back 5

anastomose

Front 6

An alternative blood route from an anastomosis is called _____ ______

Back 6

collateral circulation

Front 7

Arteries that do not anastomose are called ___ arteries

Back 7

end

Front 8

_____ are small arteries that carry blood to capillaries

Back 8

arterioles

Front 9

Through _____ and _____, arterioles assume a key role in regulating blood flow from arteries into capillaries and in altering blood pressure

Back 9

contsriction; dialation

Front 10

Capillaries are microscopic blood vessels through which materials are exchanged between ____ and ____ cells

Back 10

blood; tissue

Front 11

Some capillaries are continuous, while others are ________

Back 11

fenestrated

Front 12

Capillaries branch to form an extensive network throughout a tissue

Back 12

This network increases surface area, allowing a rapid exchange of large quantities of materials

Front 13

______ ______ regulate blood flow through capillaries

Back 13

Precapillary sphincters

Front 14

Microscopic blood vessels in the liver are called _______

Back 14

sinusoids

Front 15

Venules are small vessels that continue from capillaries to form _____

Back 15

veins

Front 16

Veins have the same three tunics as arteries, but have a thinner tunica _____ and ____

Back 16

interna; media

Front 17

The _____ of a vein is larger than that of an artery

Back 17

lumen

Front 18

Veins contain _____ to prevent a backflow of blood

Back 18

valves

Front 19

Weak valves can lead to ____ veins

Back 19

varicose

Front 20

_____ veins are veins with very thin walls

Back 20

Vascular (venous)

Front 21

Systemic veins are collectively called blood reservoirs because they hold a large volume of ______

Back 21

blood

Front 22

If the need arises, blood from systemic veins can be shifted into other veins through _______ of veins

Back 22

vasoconstriction

Front 23

The principal blood reserviors are the veins of the abdominal organs (_____, and _____) and the skin

Back 23

liver; spleen

Front 24

An increase in lumen diameter is called _______

Back 24

vasodilation

Front 25

The flow of blood from arterioles to venules through capillaries is called _______

Back 25

microcirculation

Front 26

A metarteriole is a vessel that emerges from an arteriole and supplies a group of 10-100 capillaries that constitute a ______ _____

Back 26

capillary bed

Front 27

The distal portion of a metarteriole, which empties into a venule, has no smooth muscle fibers and is called a ______ _______

Back 27

thouroughfare channel

Front 28

True capillaries emerge from arterioles or ________

Back 28

metarterioles

Front 29

Intermittent contraction and relaxtion which may occure 5-10 times a minute of a precapillary spchincter is called _______

Back 29

vasomotion

Front 30

Intercellular clefts are gaps between neighboring ______ cells

Back 30

endothelial

Front 31

Fenestrations are small holes ranging from 70-100 nm found in _____ capillaries

Back 31

fenestrated