Lecture 3/4 Flashcards
Where are we not supposed to find protein in the body?
Fluids
Interstitial Fluid
What is the difference between steady state and equilibrium?
Steady states require energy to maintain-certain concentrations are maintained and are not equal across membranes
Equilibrium has no net energy transfer between two compartments
What is Feed-Forward control?
Our body anticipates a change prior to it happening
Start line of a race-CO increases even tho not running yet
Set point deviation example and reason
Fever-protection of the body. Increase in body temp minimizes viral replication
What is redundancy?
When multiple things each do the same thing, so if one thing fails the outcome can still be reached.
Example: lots of BP controls
What is Fick’s Law?
Rate of diffusion of a substance across unit area is proportional to the concentration gradient
What are the two driving forces for water movement?
- Osmotic pressure
- Hydrostatic driving forces
What are the four characteristics that effect osmotic pressure?
- Temp
- Concentration of the solute/solution
- Degree of dissociation of solute in solution
- Gas constant
Does higher or lower than 1 indicate a substance can exist in water (Partition coefficient)
Lower than 1
If greater than 1=substance exists in oil
If equal to 1=substance exists in oil/water
What does a reflection coefficient of 1 mean?
It is all reflected by the material
How do we determine tonicity?
Relative concentration of non-penetrating solutes in solution and the cell
If a solution is hypertonic what happens to the cell?
Shrink
If a solution is hypotonic what happens to the cell?
Swell and ultimately lyse
What is an example of a deficient homeostatic mechanism?
Chronic Heart Failure-CO falls and the body responds by retaining fluid which then increases the workload of the heart and creating a bad positive feedback loop.
