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Ions, Solutes, and Solutions
Tonicity and Osmolarity
Random
100

How do you give feedback to Dr. Welch at the end of the year (and also get extra credit!)?

SPOT Eval

100

Extracellular fluid includes ___ and ____

Interstitial Fluid and Plasma

100

Usually you cannot predict tonicity from osmolarity but what is the exception to this?

Hyposmotic is always hypotonic

100

Which organ systems have the most control over the entire body?

Nervous and Endocrine

200

Positive Feedback example (200 for each)

Clot formation, Childbirth

200

Potassium is most common in which of the following?

Intracellular Fluid, Interstitial Fluid, Plasma

Intracellular fluid

200

Molarity vs Osmolarity

–Molarity=moles/L 

–Osmolarity = number of osmotically active particles/L

200

Sodium is most common in which two of the following?

Intracellular Fluid, Interstitial Fluid, Plasma

Interstitial Fluid and Plasma

300

True or False

Homeostasis is keeping the value (i.e. Blood Sugar) at a specific number (80)

False- It is usually a range

300

Which ion(s) have a higher conc outside the cell (300 points each)?

Sodium and Chloride

300

How to convert molarity to osmolarity?

Molarity times dissociation factor = osmolarity

300
When calculating osmolarity and/or tonicity, what should you assume about the starting ions?

That they are non-penetrating

400

Before the Animal Physiology exam, your heart is pounding and you start to breathe quickly. This is called what?

Feedforward Feedback

400

Proteins are most common in which two of the following?

Intracellular Fluid, Interstitial Fluid, Plasma

Intracellular Fluid and Plasma

400

π = g C σ  RT

π = Osmotic Pressure

g = number of particles per mole in solution

C= concentration (moles/L)

σ=reflection coefficient

R= Gas constant

T= Absolute temperature

400

Interstitial vs Intracellular Fluid

Intracellular- In the cell

Interstitial- Along with the plasma, forms the extracellular fluid

500

True or False- The intracellular and extracellular fluids are in a state of osmotic equilibrium. Keep in mind the differing ions

True- they are in osmotic equilibrium but in chemical and electrical disequilibrium 

500
If a substance (NaCl, urea, etc.) is nonpenetrating how does that impact finding the osmolarity if it is being added to the body?

It will stay in the ECF 

500

When calculating the osmolarity due to adding or removing a solution, what (and where) do you calculate first?

*extra 200- what does this tell you about the other locations?

Concentration/osmolarity in total body. This moves over to the ICF and ECF
500
You are filling out the osmolarity table for a patient receiving saline (water and NaCl). What is the order of finding these out?

Osmolarity

Solute

Volume 

Osmolarity. Solute. Volume 

*alphabetical order!