Blood Flow/ Hemodynamics Flashcards Preview

Physiology Exam 2 > Blood Flow/ Hemodynamics > Flashcards

Flashcards in Blood Flow/ Hemodynamics Deck (43):
1

where is the apex of the heart?

the bottom, the point

2

what are the two types of circulation?

series and parallel/ systemic vs pulmonary

3

hemodynamics is the

study of blood flow

4

CO

cardiac output, heart rate X SV

5

stroke volume

amount of blood ejected from either right or left ventricle in one beat

6

CO at rest is about

5L, i.e. total volume per minute

7

Q=

deltP/R

8

flow

(Q), driven by pressure, limited by resistance. The pressure drops down a vessel because potential energy is used.

9

Total pressure change in system is equal to

Paorta * P vena cava

10

Total peripheral resistance

frictional resistance to blood flow provided bt all vessels between aorta and right atrium . = ALL RESISTANCE (series and parallel)

11

what factors contribute to resistance/ poiseuille's

radius, viscosity, length. R is most important because variable (AND ^4 in equation), small radius change results in large resistance change.

12

MAP

mean arterial pressure. fluctuates between diastolic and systolic pressures

13

MAP=

DP + (SP-DP)/3

14

flow and velocity relationship

V= distance/time= Q/A

15

flow velocity cs cross sectional area

flow is constant, but velocity slows with increased divisions- fractionated! (want slow at capillaries)

16

Doppler

meauring cardiac output with ultrasonic. Q=V*A

cardiac output-coronary circulation

17

artery vs vessel

artery have thick outside with small lumen, elastic and muscular.

vessels: thin wall with large lumen, low resistance. Some muscle/ valves in between function.

18

pressure and volume distribution

large pulsatile flow in ventricle. Aorta limits pressure variation. Arteriole to capillary makes no pulse flow. Right atrium- very little pressure

19

aorta

pulse dampening and distribution

20

large artery

distribution of arterial blood

21

small arteries

distribution and resistance

22

arterioles

resistance, lots of smooth muscle- GREATEST P CHANGE

23

capillaries

exchange

24

venues

exchange, collection, and capacitance

25

veins

capacitance function (STORE)

26

vena cava

collection of venous blood

27

How can capillaries withstand so much pressure

Law of LaPlace- TENSION

28

tension=

T=Pr, T is wall tension. small vessels can withstand higher pressures!

29

doppler flow equation

Q=A*V

30

left ventricle goes where, right ventricle goes where

left goes systemic, right goes pulmonary

31

types of myocardium in heart walls

longitudinal, circumferential, oblique. this allows for upward pumping.

32

which ventricle is thinner walled?

right

33

loss of pulse pressure occurs where? (greatest pressure change)

arterioles

34

2/3 of heart is where In terms of midline?

left and twisted: looking in you will see R ventricle

35

atrioventricular valves

mitral/bicusupid (L) or tricuspid (R)

36

semilunar valves

aortic and pulmonary

37

intercalated disks contain

gap junctions, which allow ionic current flow. connexins

38

synctyium

formed by connections, myocardial cells function stay as a unit

39

two major features of the artery

thickness of wall and elasticity- compliance

40

systole

contraction, emptying go ventricle

41

diastole

relaxation, filling of the ventricle

42

does the cardiac output change with activity?

YES

43

equations to remember

CO = (HR) x (SV)
Q = ΔP/R
TPR = Paorta - Pvena cava / CO
R = 8 ηl /πr4
Q = ΔPπr4 / 8 ηl
MAP = DP +((SP-DP) / 3)
V = Q/A