CV 2 anatomy set two. handout page 7-15

Question 1

______are similar to precapillary sphincters but are mostly found in the mesentery.

Answer 1

metarterioles

Question 2

______can serve as a bypass channel between arterioles and venules by altering perfusion of the tissues such as closing precapillary sphincters and stopping perfusion to the mesentery while exercising.

Answer 2

metarterioles

Question 3

in this type of vessel the tunica media is normally absent but may have 1-2 layers of smooth muscle cells.

Answer 3

venules

Question 4

in this type of vessel the tunica media is normally absent but may have 1-2 layers of smooth muscle cells.

Answer 4

venules

Question 5

venules are usually found along side_____

Answer 5

arterioles

Question 6

the function of these vessels are to collect blood flow from the capillaries and they merge to form small veins

Answer 6

venules

Question 7

short, thick walled vessels that directly connect arterioles and venules

Answer 7

arteriovenous anastomoses

Question 8

arteriovenous anastomoses open and close in response to _______ stimulation not _________.

Answer 8

arteriovenous anastomoses open and close in response to sympathetic nervous stimulation not metabolic regulation.

Question 9

arteriovenous anastomoses directly connect what?

Answer 9

arterioles and venules

Question 10

found in areas where the amount of blood flow varies due to ambient temperature such as ears, hands, feet, face, nose, lips, shoulers, upper chest, nail beds, just beneath dermal capillaries

Answer 10

arteriovenous anastomoses

Question 11

found in skin that is exposed but poorly insulated by subcutaneous fat

Answer 11

arteriovenous anastomoses

Question 12

form small units called glomus bodies

Answer 12

arteriovenous anastomoses

Question 13

the primary function of _____ is thermoregulation

Answer 13

arteriovenous anastomoses

Question 14

what would happen to arteriovenous anastomoses related to SNS activity in response to cold

Answer 14

• cold
• increased SNS activity
• constrict
• less blood flow through arteriovenous anastomoses
• less heat loss through skin

opposite for hot

Question 15

_____formed from the merging of venules

Answer 15

small veins

Question 16

the tunica media of this vessel is thin 2-4 layers of smooth muscle

Answer 16

small veins

Question 17

the function of ___is to drain blood out of organs into medium sized veins

Answer 17

small veins

Question 18

the named veins of the arm elbow and below are considered ______viens.

cephalic, basilic, lesser saphenous

Answer 18

medium veins

Question 19

the tunica media of medium veins is _____with ___layers of smooth muscle.

Answer 19

thin

2-4 layers

Question 20

at intervals along only the ______sized vein/vessels the tunica media extends into the lumen as paired semilunar folds.

Answer 20

medium

Question 21

valves do not appear in what veins

Answer 21

thorax or abdomen

Question 22

the vein’s valves serve what function

Answer 22

prevent backflow and assist with propulsion of blood towards the heart

Question 23

internal jugular, brachiocephalic, pulmonary, renal, hepatic portal, vena cava are all examples of what type of vein

Answer 23

large veins

Question 24

the thickest section of the large veins would be the ______.

(superior and inferior vena cava)

Answer 24

tunica adventitia

Question 25

describe the tunica media of the large veins

Answer 25

thin with a few layers of longitudinal smooth muscle that helps control distention of the vessel

Question 26

the function of the large veins is?

Answer 26

collectively the veins(venules to large veins) contain most of the blood volume (⅔) when the body is at rest

the veins constrict to increase venous return to the heart

Question 27

some arteries found in the GI tract and joints of the limbs join together with other arteries and form______.

Answer 27

arterial anastomoses

(serve as collateral circulation)

Question 28

provide collateral circulation/more than one route for blood flow into a region of the body or organ when an artery is disrupted by accident, disease, or ligation

Answer 28

arterial anastomoses

Question 29

venous anastomoses are often found where?

Answer 29

distal body regions

Question 30

with the exception of erectile tissue there is almost no ______nerve supply to the blood vessels

Answer 30

parasympathetic