Section 2 Lecture 1 Flashcards Preview

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Flashcards in Section 2 Lecture 1 Deck (37):
1

About _#__ cells in the body:

37 trillion

2

How much blood do we have in body?

about 10 L

3

Diffusion time:

(distance^2)/ diffusion constant (10^-5 for most small molecules in H2O)

4

___ is slow and ubiquitous flow, while ___ is discrete and fast.

diffusion, convention

5

What is convection driven by?

fluid pressure gradient

6

Flow =

pressure gradient/resistance

7

Poiseuille's law of convection:

Q = 1/R(P(a)-P9(v))

8

Diffusion is driven by:

thermal energy

9

Nick's Law of Diffusion:

Jx = Px * ([X]c-[X]if)

10

The circulation functions to integrate:

the transport phenomena of the 4 exchange epithelia

11

Exchange bw the circulation and the interstitial fluid is via:

convection

12

Blood flow in the body is adjusted to match:

the rate of metabolism

13

flow supply is equal to the flow demand at this point:

flow equilibrium

14

What is the flow demand set by?

metabolism

15

Arteriole resistance is essentially proportional to:

1/metabolism (check)

16

Flow =

pressure gradient/ resistance

17

Range of blood flow per minute:

5 to 25 L

18

How long does it take for your body to change blood flow rate in response to changes in metabolic needs?

tens of seconds

19

Px=

p (density), g (gravity) h (height)

20

a cell can maintain functionality of diffusion at this PM width:

100 microns

21

Diffusion is driven by:

thermal energy (check)

22

Flow is directly proportional to:

pressure gradient

23

Flow is inversely proportional to:

resistance

24

Flux =

permeability X driving force (thermal energy expressed in concentration gradient/chemical potential

25

Is diffusion of convection used for exchange bw exchange epi and circulation?

diffusion

26

Is diffusion of convection used for exchange bw circulation and interstitial fluid?

Both

27

How is metabolism affected if resistance goes down?

Metabolism goes up

28

Convective flow must match

metabolism

29

In an overinflated balloon the pressure inside is proportional to:

wall tension

30

Pressure gradient is proportional to:

difference in volume

31

What creates the pressure gradient within our cardiovascular system?

the heart

32

static volume is AKA:

stress volume

33

Flow in to arterioles, out vs. in:

fast flow out-slow flow in

34

T or F? Resistance is infinite.

T (Infinite resistance would mean full obstruction I assume)

35

Volume and pressure increase ____ when the pump is on one valve is closed, whereas the volume and pressure both decrease ___ when the valve is later opened after the R tube has additional water build up.

lateral, exponential rate ( left half of the letter U)

36

How does the flow increase graphically when the pump is on and the valve is open?

left half of upside down U - flow is fastest when the pump is initially turned on (greatest slope)

37

When is the pressure gradient generated in our cardiovascular system?

when the pump transfers static volume from the venous reservoir to the arterial reservoir.