Physics and Chemistry-Transport process Flashcards Preview

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Flashcards in Physics and Chemistry-Transport process Deck (19)
1

who's law describes diffusion

Fick's law of diffusion

2

what is the formula for are of diffusion?

Diffusion = (P1-P2) x (Area) x (solubility)
_________________________________
(membrane thickness) x ( Square root of MW)

3

Fick's law of diffusion:
what 3 things are Directly proportional to diffusion rate (hint they are whats on top in the equation)

Partial pressure gradient
membrane area
solubility of gas in membrane

4

Fick's law of diffusion:
What 2 things are INDIRECTLY proportional to diffusion rate (hint they are whats on the bottom in the equation)

membrane thickness
Square root of MW

5

Fick's law of diffusion of gasses explains what 4 things

concentration effect
2nd gas effect
diffusion hypoxia
why turing on N20 leads to an increase in volume in gas spaces in the patients body

6

CO2 diffuses ___ times faster than O2

20 x's

7

even though CO2 is a larger molecule than O2 CO2 diffuses 20 times faster across the alveolar and capillary membrane than O2. Why is this?

Bc CO2 is 20x's more soluble than O2

8

Equilibrium of inhalation agents occurs in the body when?

when the Partial pressures of the gas are the same everywhere

9

what is the process by which the fetus receives O2 and drugs?

Diffusion

10

Diffusion of a gas from alveoli to blood (or blood to alveoli) requires what?

a difference in partial pressures

11

NON-Gases:
what are the main factors determining diffusion rate across membranes for non-gases?

concentration gradient (non-ionized)
Electrochemical gradient (ionized)
Lipid solubility
size

12

NON-Gases:
agents that poorly penetrate the BBB or placental barrier are what?

Lipid INsoluble (ionized)
Large (high molecular weights)

13

NON-Gases:
why do ions like Na+ not penetrate the lipid bilayer?

Ioinized (charged) particles are HydroPHILIC and LipoPHOBIC, the cell membrane is a phospholipid bilayer, thus ionized particles do not cross (dissolve in) the lipid portion of the cell membrane

14

Osmosis:
requires what 2 things?

a membrane impermeable to one or more solutes
a difference in the concentration of solutes

15

what/who's law describes how the intensity of light is altered as it is transmitted through a liquid? The intensity of light falls exponentially as the light passes through the liquid.

Beer's law or Beer-Lambert Law

16

How is the Beer's law or Beer-Lambert Law applied in anesthesia

the pulse oximeter

17

heat loss:
core temp refers to the intrathoracic and intracranial contents (where the vital organs are located). where are 2 areas we can measure core temp?

lower esophagus
Ear

18

heat loss:
state the 4 routes of heat loss and describe how is it done

Radiation (60%)- just radiating off body
Convection (15-30%)- air flow
Evaporation (20%) open belly/ respiratory
Conduction (

19

heat loss:(know this)
most heat is lost from the body how?

radiation

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