Q: Which of the following equations correctly represents the calculation for plasma osmolality, a key concept in fluid and electrolyte balance?

$$\text{Plasma osmolality} = 2 \times [\text{Na}^+] + \frac{[\text{Glucose}]}{18} + \frac{[\text{BUN}]}{2.8}$$

Question 1

Which of the following electrolytes is the primary cation found in the extracellular fluid and plays a crucial role in maintaining fluid balance and nerve impulse transmission?

Accepted Answer

Sodium

Question 2

A patient presents with muscle cramps, confusion, and irregular heartbeat after running a marathon on a hot day. Which electrolyte imbalance is most likely responsible for these symptoms?

Accepted Answer

Hyponatremia

Question 3

Which of the following phytochemical groups is primarily responsible for the red, blue, and purple pigmentation in fruits and vegetables and is known for its antioxidant properties?

Accepted Answer

Anthocyanins

Question 4

Which nutrient acts as a cofactor for the enzyme superoxide dismutase, thereby supporting the antioxidant defense system?

Accepted Answer

Zinc

Question 5

A deficiency in which of the following nutrients is most likely to result in impaired collagen synthesis and poor wound healing due to its role as a cofactor in hydroxylation reactions?

Accepted Answer

Vitamin C

Question 6

Which of the following nutrients is essential for the activation of osteocalcin, a protein involved in bone mineralization?

Accepted Answer

Vitamin K

Question 7

A 65-year-old woman is diagnosed with osteoporosis. Which combination of nutrients is most critical for her to maintain bone health and reduce fracture risk?

Accepted Answer

Calcium and Vitamin D

Question 8

Which of the following nutrients is required for the synthesis of hemoglobin and its deficiency can lead to microcytic anemia?

Accepted Answer

Iron

Question 9

A patient with a diet low in leafy green vegetables develops impaired blood clotting. Which nutrient deficiency is most likely responsible?

Accepted Answer

Vitamin K

Question 10

Which of the following nutrients is a significant coenzyme in energy metabolism, specifically in the conversion of pyruvate to acetyl-CoA?

Accepted Answer

Thiamin (Vitamin B1)

Question 11

A person consumes a diet rich in cruciferous vegetables such as broccoli and cabbage. Which group of phytochemicals are they most likely increasing in their diet, and what is a potential health benefit?

Accepted Answer

Glucosinolates; may reduce cancer risk

Question 12

Which of the following equations correctly represents the calculation for plasma osmolality, a key concept in fluid and electrolyte balance?

Accepted Answer

$$	ext{Plasma osmolality} = 2 	imes [	ext{Na}^+] + \frac{[	ext{Glucose}]}{18} + \frac{[	ext{BUN}]}{2.8}$$

Question 13

Which nutrient is a significant antioxidant that protects cell membranes from oxidative damage by neutralizing free radicals?

Accepted Answer

Vitamin E

Question 14

A patient with a genetic disorder affecting the absorption of intrinsic factor is most likely to develop which type of anemia?

Accepted Answer

Pernicious anemia

Question 15

Which of the following nutrients plays a supporting role in energy metabolism by acting as a cofactor for enzymes involved in glycolysis and the TCA cycle?

Accepted Answer

Magnesium

Question 16

A 30-year-old vegan presents with fatigue and numbness in her hands and feet. Laboratory tests reveal macrocytic anemia. Which nutrient deficiency is most likely?

Accepted Answer

Vitamin B12

Question 17

Which of the following best describes the role of parathyroid hormone (PTH) in bone health?

Accepted Answer

PTH stimulates bone resorption to increase blood calcium levels

Question 18

Which of the following nutrients is required for the conversion of homocysteine to methionine, thus supporting both blood health and energy metabolism?

Accepted Answer

Folate

Question 19

A patient is found to have low serum sodium ($$[	ext{Na}^+]) $$and high urine sodium after prolonged vomiting. Which condition best explains these findings?

Accepted Answer

Syndrome of inappropriate antidiuretic hormone (SIADH)

Question 20

Which of the following nutrients is a significant coenzyme in the electron transport chain, supporting ATP production during energy metabolism?

Accepted Answer

Niacin (Vitamin B3)

Key Topics in Nutrition: Fluid Balance, Phytochemicals, Antioxidants, Bone & Blood Health, Energy Metabolism

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