Which organs are most affected by thiamine?
The heart and lungs
The brain and heart
The liver and kidneys
The muscles and ligaments
The Correct Answer is B
A. While the heart may be affected by severe thiamine deficiency, the lungs are not directly impacted by thiamine status. Lung function is largely independent of thiamine.
B. Thiamine (vitamin B1) is essential for carbohydrate metabolism and energy production in cells, especially in tissues with high metabolic demands. The brain and heart are particularly sensitive to thiamine deficiency because they require constant energy supply to function. Inadequate thiamine can lead to neurological disorders such as Wernicke’s encephalopathy and peripheral neuropathy, as well as cardiovascular complications like beriberi, which can manifest as heart failure or tachycardia.
C. The liver and kidneys play key roles in metabolism and excretion but are not the primary organs affected by thiamine deficiency. They are less sensitive to energy deficits caused by thiamine insufficiency.
D. Muscles and ligaments are involved in movement and support but are not the main organs impacted by thiamine deficiency. Muscle weakness may occur indirectly, but the primary effects are neurological and cardiac.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Bone tissue is composed of osteocytes, which are mature bone cells embedded in a mineralized matrix. Osteocytes help maintain bone structure, regulate mineral content, and communicate with other bone cells to support bone remodeling and repair. Bone tissue provides structural support, protects vital organs, facilitates movement by serving as attachment sites for muscles, and stores minerals such as calcium and phosphorus.
B. Liver tissue is made up of hepatocytes, not osteocytes. The liver functions in metabolism, detoxification, and bile production, rather than providing structural support like bone tissue.
C. Lymph is a fluid tissue composed of lymphocytes and other immune cells, not osteocytes. It plays a role in immune defense and fluid balance, not skeletal support.
D. Blood is a connective tissue composed of erythrocytes, leukocytes, and platelets suspended in plasma. It does not contain osteocytes and functions primarily in transport of oxygen, nutrients, waste, and immune cells.
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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