The Cell: Guide Questions

8/8/2019 The Cell: Guide Questions

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Oncotic Pressure colloid osmotic

pressure

osmotic pressureexerted by proteinsthat tends to pullwater into the

circulatory system attract or pull fluid into

its compartment


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Osmotic pressure The hydrostatic

pressure that will

prevent movement ofwater from the

compartment of low

osmolarity to a

compartment of highosmolarity.


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Osmolality

The total concentration of solute per Kg of the solvent

Effective Osmolale RC of 1: completely impermeable

Induces permanent change in volume

Total Osmole Total number of both the effective and ineffective

osmole


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Tonicity

a measure of the osmotic pressure of two

solutions separated by a semipermeablemembrane

influenced only by non-penetrating solutes

Varying levels of tonicity determine watermovement


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Differentiate Hypertonic, Isotonic and

Hypotonic Solutions


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Hypertonic Solution Cell placed in asolution of NPS

greater than 300

mOsm

Cell Shrinks

Decrease in cell

volume The cell has higher

water concentration

compared to the

solution.


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Isotonic Solution Cell placed in a

solution of NPS equal

to 300 mOsm

Cell Size Remains The cell has the same

water concentrationcompared to thesolution.


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Hypotonic Solution Cell placed in a solution

of NPS less than 300

mOsm

Cell Swells

Increase in cell volume

The cell has lower water

concentration compared to

the solution.


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Dehydration

It is a decrease in total bodywater without anequal reduction in total bodysodium.

Dehydrated patient withborderline blood pressure Drink more water until you reach

at least a daily consumption ofbetween 10 - 12 glasses

exercise as much as hydrationbecause exercise may improvevessel tone & increase bloodvolume


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Dehydration Treatment(Davidsons Principles and Practice of Internal Medicine 19

th

Ed.)

Mild: 0.9% saline 1 litre i.v. 6-12

hours hourly

Moderate: 0.9% saline 1 litres i.v. over

2-4 hours

Severe: 0.9% saline 2 litres i.v. over

4-6hours

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