Which of the following statements is true?

Which of the following statements is true?
 a. People develop their peak bone mass during the first four decades of life.
 b. The skeleton no longer adds to bone density after 20 years of age.
 c. The bones begin to lose density after 40 years of age regardless of calcium intake.
  d. People do not need calcium throughout life.
 e. Low blood calcium is sensed by the brain and converted to a signal that increases intake of dairy foods.

Q. 2

It is critical for body cells to maintain fluid and electrolyte balance by:
 a. increasing intake of sodium when a person becomes dehydrated.
 b. allowing minerals to slip freely across the cell membranes.
 c. attracting water into the cell through increased electrolyte concentrations.
  d. keeping the majority of water outside the cells.
 e. allowing minerals to follow the flow of water.

Q. 3

When a child has a virus that has caused vomiting and diarrhea over several days' time, it is critical for her to receive medical care because:
 a. her fever will cause her to retain too much extra fluid.
 b. she may need help in replacing extreme fluid losses.
 c. in the cells, sodium concentration increases, leading to danger of swelling.
  d. her kidneys will pump extra fluids into the bloodstream.
 e. the illness may have been caused by contaminated drinking water.

Q. 4

Jennifer says she drinks bottled water because it is safer than tap water. You tell her that bottled water:
 a. has been withdrawn from an underwater spring and is naturally pure.
  b. has been filtered by the manufacturer to remove contaminants.
 c. all tastes exactly the same as tap water.
 d. may be treated tap water.
 e. is a sound environmental decision.

Q. 5

What statement is true regarding water chlorination?
 a. It has no effect on many harmful microorganisms found in water.
 b. It has been documented to cause cancer in people who drink it regularly.
 c. Alternative treatment systems for water are much less expensive and faster to use than chlorination.
  d. Deaths from organisms in non-chlorinated water are common in some parts of the world.
  e. It does not easily kill disease-causing organisms in water.

Q. 6

A friend informs you that she is planning to purchase a water softener. Which statement is most appropriate for you to make to your friend?
 a. Hard water makes more bubbles with less soap than soft water and is more desirable.
  b. Soft water leaves a ring in the tub and a gray residue in the wash, which are undesirable.
  c. Soft water appears to aggravate hypertension, which is undesirable.
 d. Soft water has higher concentrations of calcium and magnesium than hard water, which is desirable.
  e. There is no difference in mineral content of soft and hard waters.

Q. 7

Which is the most accurate statement about beverage consumption practices in the U.S.?
 a. The average calorie intake from beverages among U.S. adults over 20 years old increases with age.
  b. Vegetable juices are a concern because their intake adds a significant amount of discretionary calories.
  c. The mild diuretic effect of a moderate intake of caffeinated beverages does not prevent people from meeting fluid needs.
  d. Artificially sweetened carbonated beverages do not crowd more nutritious foods out of the diet.
  e. Sports beverages are beneficial because most exercisers need the extra carbohydrate for fuel.

Q. 8

What is the best beverage choice?
 a. sports drinks because they replace important minerals missing from the diet
  b. hard water because it has a high concentration of calcium and magnesium
  c. soft water because it replaces sodium that is lost from the body
 d. fruit juices because they naturally contain vitamins and minerals
 e. bottled water because it is guaranteed to be safe