What is the most abundant mineral in our body?
Calcium
Fluoride
Iron
Zinc
The Correct Answer is A
A. Calcium is the most abundant mineral in the human body. Approximately 99% of the body’s calcium is stored in bones and teeth, providing structural strength and support. The remaining 1% is found in blood, muscle, and other tissues, where it plays a critical role in muscle contraction, nerve transmission, blood clotting, and cellular signaling. Adequate calcium intake throughout life is essential to maintain bone density, prevent osteoporosis, and support overall physiological functions.
B. Fluoride is a trace mineral primarily found in teeth and bones. It helps strengthen tooth enamel and prevent dental caries by making enamel more resistant to acid produced by bacteria. However, fluoride is present in much smaller amounts compared to calcium and does not contribute significantly to skeletal structure. Its primary role is dental protection rather than overall mineral abundance.
C. Iron is essential for oxygen transport in hemoglobin and myoglobin, as well as for various enzymatic reactions in metabolism. Iron deficiency can lead to anemia, fatigue, and impaired immune function. Despite its critical physiological roles, iron is a trace mineral in terms of total body content and is far less abundant than calcium. The majority of iron is stored in hemoglobin within red blood cells, with smaller amounts in the liver and muscle tissues.
D. Zinc is another trace mineral required for numerous enzymatic functions, immune system support, wound healing, DNA synthesis, and growth. It is vital for health but is present in relatively small amounts in the body compared to calcium. Zinc deficiency can cause growth retardation, immune dysfunction, and delayed wound healing, but its total body content is minimal.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Disaccharides are carbohydrates composed of two sugar molecules linked together, such as sucrose (table sugar), lactose, and maltose. They are simpler than polysaccharides and provide quick energy but are not considered complex carbohydrates.
B. Monosaccharides are the simplest form of carbohydrates, consisting of a single sugar molecule such as glucose, fructose, or galactose. They are the building blocks of more complex carbohydrates but are not complex carbohydrates themselves.
C. Glycogen is a specific type of polysaccharide that serves as the body’s storage form of glucose in liver and muscle tissues. While glycogen is a complex carbohydrate, the term in the question refers to complex carbohydrates in general, not just the stored form.
D. Polysaccharides are complex carbohydrates composed of long chains of glucose units linked together. Examples include starch (found in plants), glycogen (stored in animals), and cellulose (a structural component in plants). Polysaccharides provide sustained energy as they are broken down more slowly than simple sugars and play roles in energy storage and structural support.
Correct Answer is D
Explanation
A. Subcutaneous fat is stored directly under the skin and serves as an energy reserve, insulation, and padding. While it contributes to overall body fat, it is not located deep within the abdominal cavity and is less strongly associated with metabolic risk.
B. Essential fat is the minimum amount of fat necessary for normal physiological functions, including hormone production, nerve function, and reproductive health. Essential fat is distributed throughout the body and is not specifically concentrated around internal organs.
C. Brown fat is a type of adipose tissue rich in mitochondria that generates heat through thermogenesis. It is primarily found in newborns and small amounts in adults, usually around the neck and upper back, and does not accumulate around the abdominal organs.
D. Visceral fat is the adipose tissue located deep within the abdominal cavity, surrounding vital organs such as the liver, pancreas, and intestines. Excess visceral fat is strongly linked to increased risk of metabolic disorders, cardiovascular disease, insulin resistance, and type 2 diabetes. It differs from subcutaneous fat because of its location and its impact on health.
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