Section 2 Lecture 1 Flashcards
About _#__ cells in the body:
37 trillion
How much blood do we have in body?
about 10 L
Diffusion time:
(distance^2)/ diffusion constant (10^-5 for most small molecules in H2O)
___ is slow and ubiquitous flow, while ___ is discrete and fast.
diffusion, convention
What is convection driven by?
fluid pressure gradient
Flow =
pressure gradient/resistance
Poiseuille’s law of convection:
Q = 1/R(P(a)-P9(v))
Diffusion is driven by:
thermal energy
Nick’s Law of Diffusion:
Jx = Px * ([X]c-[X]if)
The circulation functions to integrate:
the transport phenomena of the 4 exchange epithelia
Exchange bw the circulation and the interstitial fluid is via:
convection
Blood flow in the body is adjusted to match:
the rate of metabolism
flow supply is equal to the flow demand at this point:
flow equilibrium
What is the flow demand set by?
metabolism
Arteriole resistance is essentially proportional to:
1/metabolism (check)
Flow =
pressure gradient/ resistance
Range of blood flow per minute:
5 to 25 L
How long does it take for your body to change blood flow rate in response to changes in metabolic needs?
tens of seconds
Px=
p (density), g (gravity) h (height)
a cell can maintain functionality of diffusion at this PM width:
100 microns
Diffusion is driven by:
thermal energy (check)
Flow is directly proportional to:
pressure gradient
Flow is inversely proportional to:
resistance
Flux =
permeability X driving force (thermal energy expressed in concentration gradient/chemical potential
Is diffusion of convection used for exchange bw exchange epi and circulation?
diffusion
Is diffusion of convection used for exchange bw circulation and interstitial fluid?
Both
How is metabolism affected if resistance goes down?
Metabolism goes up
Convective flow must match
metabolism
In an overinflated balloon the pressure inside is proportional to:
wall tension
Pressure gradient is proportional to:
difference in volume
What creates the pressure gradient within our cardiovascular system?
the heart
static volume is AKA:
stress volume
Flow in to arterioles, out vs. in:
fast flow out-slow flow in
T or F? Resistance is infinite.
T (Infinite resistance would mean full obstruction I assume)
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)
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)
When is the pressure gradient generated in our cardiovascular system?
when the pump transfers static volume from the venous reservoir to the arterial reservoir.
