NTA Nutritional Science Fundamentals — Questions and Answers
Question 1: Which macronutrient is the primary source of energy for the human body?
- Proteins
- Carbohydrates (Correct answer)
- Fats
- Vitamins
Correct answer: Carbohydrates
Carbohydrates are the body's preferred and most readily available source of energy. They are broken down into glucose, which is used by cells for fuel, especially for the brain and muscles. While proteins and fats also provide energy, carbohydrates are the primary macronutrient dedicated to this vital function.
Question 2: Which vitamin is fat-soluble and essential for blood clotting?
- Vitamin C
- Vitamin A
- Vitamin K (Correct answer)
- Vitamin B12
Correct answer: Vitamin K
Vitamin K is a fat-soluble vitamin critically important for blood coagulation. It plays a key role in the synthesis of several proteins required for blood clotting, preventing excessive bleeding. Deficiencies can lead to impaired clotting and increased bruising.
Question 3: What mineral is important for oxygen transport in the blood?
- Calcium
- Iron (Correct answer)
- Magnesium
- Zinc
Correct answer: Iron
Iron is an essential mineral primarily known for its role in oxygen transport. It is a crucial component of hemoglobin, a protein in red blood cells that binds oxygen in the lungs and carries it throughout the body. Without sufficient iron, the body cannot produce enough healthy red blood cells, leading to fatigue and anemia.
Question 4: Which nutrient is essential for building and repairing body tissues?
- Proteins (Correct answer)
- Carbohydrates
- Fats
- Water
Correct answer: Proteins
Proteins are fundamental macronutrients essential for building, repairing, and maintaining virtually all body tissues, including muscles, organs, skin, and hair. They are composed of amino acids, which serve as the building blocks for enzymes, hormones, and other vital molecules. Adequate protein intake is crucial for growth, recovery, and overall physiological function.
Question 5: Which vitamin deficiency causes scurvy?
- Vitamin A
- Vitamin D
- Vitamin C (Correct answer)
- Vitamin E
Correct answer: Vitamin C
Scurvy is a classic deficiency disease caused by an inadequate intake of Vitamin C (ascorbic acid). Vitamin C is essential for the synthesis of collagen, a vital protein for healthy connective tissues, blood vessels, and skin. Without sufficient Vitamin C, the body cannot properly form collagen, leading to symptoms like bleeding gums, easy bruising, and poor wound healing.
Question 6: What is the role of dietary fiber in nutrition?
- Provides energy
- Builds muscle
- Supports digestion (Correct answer)
- Supplies vitamins
Correct answer: Supports digestion
Dietary fiber is a type of carbohydrate that the human body cannot digest or absorb. Instead, it passes through the digestive system largely intact, adding bulk to stool and promoting regular bowel movements. This process helps prevent constipation, supports a healthy gut microbiome, and contributes to overall digestive wellness.
Question 7: Which macronutrient is the most energy-dense?
- Carbohydrates
- Proteins
- Fats (Correct answer)
- Water
Correct answer: Fats
Fats are the most energy-dense macronutrient, providing approximately 9 calories per gram. In comparison, carbohydrates and proteins each supply about 4 calories per gram. This higher caloric density makes fats an efficient source of stored energy for the body and crucial for various physiological functions.
Question 8: Which vitamin is primarily synthesized in the skin upon exposure to sunlight?
- Vitamin B12
- Vitamin D (Correct answer)
- Vitamin K
- Vitamin E
Correct answer: Vitamin D
Vitamin D is unique because the human body can synthesize it in the skin when exposed to ultraviolet B (UVB) radiation from sunlight. This process converts a precursor molecule into an active form of vitamin D. While it can also be obtained from certain foods, sunlight exposure is a primary natural source for its production.
Question 9: Which nutrient helps regulate fluid balance and nerve function?
- Sodium
- Potassium (Correct answer)
- Calcium
- Iron
Correct answer: Potassium
Potassium is an essential electrolyte that plays a crucial role in regulating fluid balance within the body, working in tandem with sodium. It is also vital for proper nerve impulse transmission and muscle contraction, including the critical function of the heart muscle. Maintaining adequate potassium levels is therefore essential for overall physiological function.
NTA Nutritional Science Fundamentals
Which macronutrient is the primary source of energy for the human body?