Questions: Which of the following statements are true? The dietary need for each trace mineral is less than 100 micrograms daily. Hypernatremia may lead to an abnormal increase in blood volume. A blood pressure of 120 / 80 mmHg is considered normal. All of the statements are true. None of the statements are true. Hyponatremia results from sodium consumption of less than 100 mg

The answer is the third one: A blood pressure of \(120 / 80 \mathrm{mmHg}\) is considered normal.

Explanation for each option:

1. The dietary need for each trace mineral is less than 100 micrograms daily.
   This statement is incorrect. While trace minerals are required in small amounts, the dietary need for many trace minerals is more than 100 micrograms daily. For example, the recommended dietary allowance (RDA) for iron is much higher than 100 micrograms.

2. Hypernatremia may lead to an abnormal increase in blood volume.
   This statement is incorrect. Hypernatremia refers to high sodium levels in the blood, which can lead to dehydration and a decrease in blood volume, not an increase.

3. A blood pressure of \(120 / 80 \mathrm{mmHg}\) is considered normal.
   This statement is correct. A blood pressure reading of \(120 / 80 \mathrm{mmHg}\) is generally considered to be within the normal range for adults.

4. All of the statements are true.
   This statement is incorrect because not all the statements are true.

5. None of the statements are true.
   This statement is incorrect because the statement about blood pressure is true.

6. Hyponatremia results from sodium consumption of less than 100 mg.
   This statement is incorrect. Hyponatremia is a condition characterized by low sodium levels in the blood, but it is not directly caused by consuming less than 100 mg of sodium. It is usually due to an imbalance in water and sodium in the body.

In summary, the correct statement is that a blood pressure of \(120 / 80 \mathrm{mmHg}\) is considered normal.