Vascular Anatomy Flashcards Preview

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Flashcards in Vascular Anatomy Deck (23):
1

Tunica Adventitia

-outter connective tissue made of collagen fibers
-protect vessel and hold to surrounding tissues

2

3 Vessel Layers

-tunica intima
-tunica media
-tunica adventitia

3

Tunica Media

-circular smooth muscle with elastin and proteoglycans
-allow constriction/dilation of vessels
-deparated from adventitia by external elastic laminae

4

Thickest Artery Layers

-tunica media
-due to increased pressure

5

Primary Elastin Arteries

-Aorta
-branches closest to heart

6

Primary Muscular Arteries

-arteries other than aorta

7

Diastolic Pressure

-pressure in Aa during ventricular relaxation
-reflect peripheral resistance or ability of blood to flow from Aa to capillaries

8

Diastolic pressure reflects:

peripheral resistance
(ability of blood to flow from Aa to capillaries)

9

Arterioles

-"resistance vessels"
-Primarily smooth muscle
-can act as control valves
-no pulse

10

2 artery types

-primarily elastin
-primarily muscular

11

systolic pressure

-pressure within Aa during ventricular contraction
-reflects work of heart and strain of Aa

12

Systolic pressure reflects

work of heart and strain of Aa

13

Precapillary sphincters

-between metarterioles and capillaries to control blood flow locally
-during exercise to increase blood flow to muscles and decrease to organs

14

Precapillary Sphincters Open in response to

-Increased: CO2, H+, Lactate
-Decreased: pH, O2

15

Histamines and Capillary Pores

-histamines cause cell tightening and pore widening
-allows large proteins to escape that normally can't

16

Veins

-reservoir/store blood
-get blood back to heart
-@ rest they hold about 64% of blood
-primarily made of adventitia with little elastin

17

Capillaries

-separated from metarterioles by precapillary sphincters
-exchange nutrients and waste and fluids
-single cell layer

18

Venules

-collect blood from capillaries

19

Tunica Intima

-single layer of squamous endothelial cells
-impermiable to large proteins (small proteins can pass through)
-separated from media by internal elastic lamina

20

MAP

-mean arterial pressure
-average pressure at which blood flows
-reflects ability of blood to perfuse tissue

21

Normal MAP

70-110mmHg
-<60mmHg=inadequate tissue perfusion

22

MAP=

MAP=DBP + 1/3 (SBP-DBP)

23

Diffusion in Capillaries

-through cells or pores between cells
-lipid soluble stuff goes through cells
-glucose, amino acids, ions go through pores
-large proteins confined to plams