CV 2 anatomy set two. handout page 7-15 Flashcards Preview

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Flashcards in CV 2 anatomy set two. handout page 7-15 Deck (30)
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1
Q

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

A

metarterioles

2
Q

______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.

A

metarterioles

3
Q

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

A

venules

4
Q

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

A

venules

5
Q

venules are usually found along side_____

A

arterioles

6
Q

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

A

venules

7
Q

short, thick walled vessels that directly connect arterioles and venules

A

arteriovenous anastomoses

8
Q

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

A

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

9
Q

arteriovenous anastomoses directly connect what?

A

arterioles and venules

10
Q

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

A

arteriovenous anastomoses

11
Q

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

A

arteriovenous anastomoses

12
Q

form small units called glomus bodies

A

arteriovenous anastomoses

13
Q

the primary function of _____ is thermoregulation

A

arteriovenous anastomoses

14
Q

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

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

opposite for hot

15
Q

_____formed from the merging of venules

A

small veins

16
Q

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

A

small veins

17
Q

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

A

small veins

18
Q

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

cephalic, basilic, lesser saphenous

A

medium veins

19
Q

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

A

thin

2-4 layers

20
Q

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

A

medium

21
Q

valves do not appear in what veins

A

thorax or abdomen

22
Q

the vein’s valves serve what function

A

prevent backflow and assist with propulsion of blood towards the heart

23
Q

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

A

large veins

24
Q

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

(superior and inferior vena cava)

A

tunica adventitia

25
Q

describe the tunica media of the large veins

A

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

26
Q

the function of the large veins is?

A

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

27
Q

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

A

arterial anastomoses

(serve as collateral circulation)

28
Q

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

A

arterial anastomoses

29
Q

venous anastomoses are often found where?

A

distal body regions

30
Q

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

A

parasympathetic