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Problem set: water and solute movement across membranes - page 10 / 10

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Problem set: water and solute movement across membranes

37.

For each of the following solutions, state the osmolarity and tonicity relative to a normal person's body fluids: (Note that these are hypothetical, not real, IV fluids).

Fluid

Osmolarity

Tonicity

400 mOsM NaCl

400 mOsM glucose

distilled (pure)  water

2.5 % glucose in 0.9% NaCl

2.5 % glucose in 0.45% NaCl

38.

Fred was hiking at Enchanted Rock State Park when he stepped in a hole, breaking his leg. Answer the following questions about his situation:   (2pts each)

a.

Fred weighs 95 kg. How many pounds does he weigh?

b.

Before the accident, Fred had a normal body osmolarity of 280 mOsM.  If, at that time he had 15.96 osmoles total in his body, how many liters of total body water did he have?

c.

It was hours before help arrived and Fred had no water to drink.  While waiting,  Fred was sweating. Total in his sweat, he lost 300 mosmoles of solute and 1875 ml of water.  What was the osmolarity of his sweat?

d.

Given the above-calculated osmolarity of his lost sweat, how did Fred's body osmolarity change while waiting?  His osmolarity increased or decreased        (circle your answer)

e.

The emergency health care team gives Fred 1L of a 0.45% NaCl IV solution. This solution is hypotonicisotonichypertonic (circle answer)

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