intro 2 Flashcards Preview

CV exam 1 wk 1 > intro 2 > Flashcards

Flashcards in intro 2 Deck (29):
1

Coronary arteries arise from

root of aorta

2

right main coronary artery

1. supplies left atrium and ventricle
2. bifurcates to left anterior descending and circumflex arteries

3

widow maker

LAD (left anterior descending artery)

4

coronary veins

1. mostly parallel the coronary arteries
2. many veins drain into coronary sinus, a large vein on the posterior side of the heart that empties into the right atrium
3. some drain directly to the right atrium

5

coronary capillaries

very dense--several capillaries associated with each cardiac myocytes

6

arterial system

1. distribution
2. aorta, large artery, small artery, arteriole

7

microcirculation

1. exchange and filtration
2. capillaries

8

venous system

1. collection
2. venule, vein, vena cava

9

aorta

1. large single outflow from left side of heart (~25 mm diameter)
2. Elastic & smooth muscle fibers – compliance helps dampen pulsatile flow

10

Arteries

1. Thick walled, to resist expansion
2. Primarily serve to distribute blood to different organs

11

Arterioles

1. Relatively thicker walls, with lots of vascular smooth muscle
2. Highly innervated – primary site of regulation of vascular resistance
3. “resistance vessels” (small arteries & arterioles)

12

Capillaries

1. Exchange vessels
2. Walls = single cell layer of endothelial cells

13

Venules, Veins

1. Thin walls relative to similar diameter arteries
2. “capacitance vessels” – most of blood volume
3. Low pressure, with one-way valves

14

Vena Cavae

1. Two branches (superior vena cava & inferior vena cava)
2. Large diameter, but very thin wall (very low pressure)

15

Tunica adventitia

1. outermost layer
2. connective tissue (collagen & elastin)

16

Tunica media

1. middle layer
2. Innervated smooth muscle cells
3. Controls vessel diameter

17

Tunica intima

1. inner layer
2. connective tissue and vascular endothelium
3. Important for signaling
4. Site of atherosclerotic plaque formation

18

capillaries are the site of

gas, nutrient and waste exchange

19

Blood flow through capillary beds determined by

pressure gradients

20

blood flow through capillary bed is regulated by

arterioles & precapillary sphincters

21

precapillary sphincters =

smooth muscle bands at junction of arteriole and capillaries

22

the lymphatic system is a pathway for

fluid and large molecules to move from interstitial space to blood

23

Lymph is

filtered interstitial fluid (filtered in Lymph Nodes)

24

lymphatic capillaries are

porous blind end capillaries

25

Flow in lymphatic system is promoted by:

1. increased interstitial pressure
2. smooth muscle contraction in lymph vessels
3. contraction of surrounding skeletal muscle

26

Lymphatic system is

low pressure, vessels have one-way valves

27

Lymph flow ____ per day

~2-4 L

(vs. 7000 L blood flow per day)

28

which vessel layer controls vessel diameter?

tunica media

29

which is the site of atherosclerotic plaque formation?

tunica intima