Pre-Lab Quiz
Water Balance
Name _____________________AUID____________Date___________
1. Of the total body weight of a male of average build about:
A. 40% is water.
B. 50% is water.
C. 60% is water.
D. 70% is water.
2. Of the total body weight of a female of average build about:
A. 45% is water.
B. 50% is water.
C. 65% is water.
D. 75% is water.
3. Select the statement that is not correct:
A. About two-thirds of the body water is found in cells.
B. About one-third of the body water is found in the plasma.
C. Fat cells contain far less water than other cells.
D. The fluid that surrounds cells and lies outside of the capillaries is called the
interstitial fluid.
4. Select the statement that is not correct:
A. Insensible loss of water from the skin occurs through the sweat glands and
Lung surface.
B. Normally, loss of water from the lungs each day is about five times more than
loss in the feces.
C. The rate at which we sweat is determined by the need to lose heat, not water,
from the body.
D. To excrete the waste products of metabolism and remain in solute balance, we
must produce a minimum of 500 ml of urine each day.
5. The most important determinant of the sensation of thirst is the:
A. Intake of sodium in the diet.
B. Circulating blood volume.
C. Osmolarity of the plasma.
D. Body temperature.
6. The most important determinant of the release of ADH from the neurohypophysis is
the:
A. Intake of sodium in the diet.
B. Circulating blood volume.
C. Osmolarity of the plasma.
D. Body temperature.
©2007
Pre-Lab Quiz
Water Balance
7. Select the statement about ADH secretion that is not correct:
A. ADH secretion is increased by vigorous exercise.
B. ADH is secreted during deep sleep.
C. ADH is released into the blood directly from the supraoptic nuclei in the
hypothalamus.
D. ADH secretion is increased by increasing plasma osmolarity.
8. Water is:
A. Readily absorbed from the stomach.
B. Only absorbed from the small intestine following solute absorption there.
C. Absorbed from the intestine only if ADH is present.
D. Absorbed most rapidly from very dilute intestinal fluid.
9. Which one of the following is correct, Glucose:
A. Is readily absorbed from the stomach.
B. Needs to be digested before it can be absorbed.
C. Is rapidly removed from the portal circulation by the liver.
D. Is excreted by the kidneys whenever the plasma concentration rises above
normal.
10. Select the statement about renal function in a healthy young adult that is not correct:
A. About 125 ml of plasma are filtered each minute.
B. Most of the filtered water is excreted in the urine unless ADH is present.
C. The urine can be more or less concentrated than the plasma.
D. Most of the filtered water is reabsorbed secondary to solute reabsorption.
11. Select the statement about sodium that is not correct:
A. Excess sodium taken in the diet is rapidly (over an hour or so) excreted in the
urine.
B. Under normal circumstances, sodium is confined to the extracellular
compartment.
C. The volume of the extracellular compartment is determined by its sodium
content.
D. Sweat is a hypo-osmotic sodium chloride solution whose rate of secretion is
determined by the need to cool the body.
12. Select the statement about urine osmolarity that is not correct:
A. It can be estimated by measuring the urine specific gravity.
B. It can range between about 50 to 1200 mosmol/L.
C. It is higher when the body needs to retain water.
D. It reaches a minimum when ADH concentrations in the plasma are at their
highest.
©2007
Pre-Lab Quiz
Water Balance
13. Select the statement that is not correct:
A. Diet soda drinks such as Sprite Zero can be regarded as equivalent to water in
terms of how the body handles them.
B. Campbells Regular Tomato Juice has virtually the same sodium concentration
as human extracellular fluid.
C. Soda drinks such as Sprite contain relatively high concentrations of glucose
and are hyperosmotic to human plasma.
D. Drinking 800 ml of Sprite or similar sodas, results in glucose appearing in the
urine in normal people.
©2007