Section 2 Lecture 1 Flashcards Preview

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

About _#__ cells in the body:

A

37 trillion

2
Q

How much blood do we have in body?

A

about 10 L

3
Q

Diffusion time:

A

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

4
Q

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

A

diffusion, convention

5
Q

What is convection driven by?

A

fluid pressure gradient

6
Q

Flow =

A

pressure gradient/resistance

7
Q

Poiseuille’s law of convection:

A

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

8
Q

Diffusion is driven by:

A

thermal energy

9
Q

Nick’s Law of Diffusion:

A

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

10
Q

The circulation functions to integrate:

A

the transport phenomena of the 4 exchange epithelia

11
Q

Exchange bw the circulation and the interstitial fluid is via:

A

convection

12
Q

Blood flow in the body is adjusted to match:

A

the rate of metabolism

13
Q

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

A

flow equilibrium

14
Q

What is the flow demand set by?

A

metabolism

15
Q

Arteriole resistance is essentially proportional to:

A

1/metabolism (check)

16
Q

Flow =

A

pressure gradient/ resistance

17
Q

Range of blood flow per minute:

A

5 to 25 L

18
Q

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

A

tens of seconds

19
Q

Px=

A

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

20
Q

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

A

100 microns

21
Q

Diffusion is driven by:

A

thermal energy (check)

22
Q

Flow is directly proportional to:

A

pressure gradient

23
Q

Flow is inversely proportional to:

A

resistance

24
Q

Flux =

A

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

25
Q

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

A

diffusion

26
Q

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

A

Both

27
Q

How is metabolism affected if resistance goes down?

A

Metabolism goes up

28
Q

Convective flow must match

A

metabolism

29
Q

In an overinflated balloon the pressure inside is proportional to:

A

wall tension

30
Q

Pressure gradient is proportional to:

A

difference in volume

31
Q

What creates the pressure gradient within our cardiovascular system?

A

the heart

32
Q

static volume is AKA:

A

stress volume

33
Q

Flow in to arterioles, out vs. in:

A

fast flow out-slow flow in

34
Q

T or F? Resistance is infinite.

A

T (Infinite resistance would mean full obstruction I assume)

35
Q

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.

A

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

36
Q

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

A

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

37
Q

When is the pressure gradient generated in our cardiovascular system?

A

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