Which of the following body structures requires fats as a key part of its structure?
Cell membranes
Muscles
Bones
Hair and nails
The Correct Answer is A
A. Cell membranes:
Cell membranes are composed of phospholipids, which are fats. These fats help maintain cell structure and fluidity.
B. Muscles:
Muscles are primarily made of protein, not fats. While fats can be used as an energy source, they are not structural components of muscle.
C. Bones:
Bones are made up of calcium and collagen (a protein). They do not rely on fats for their primary structure.
D. Hair and nails:
Hair and nails are composed of keratin, a protein. Though fat plays a role in skin health, it is not a structural component of hair or nails.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. 20–35%:
According to the Dietary Guidelines for Americans, total fat intake should be 20–35% of total daily calories for adults.
B. 75–80%:
This is excessively high and typically only seen in ketogenic diets, which are not standard recommendations.
C. 60–75%:
Still too high for general dietary guidelines. Long-term high-fat diets at this level may raise health risks.
D. 45–50%:
Higher than the recommended range. This amount of fat exceeds standard DRI recommendations for a balanced diet.
Correct Answer is C
Explanation
A. Blood circulation:
Unlike carbohydrates and proteins, fats are too large to enter the blood directly after digestion. They are transported via the lymphatic system first.
B. The kidneys:
The kidneys are involved in filtering blood, not in the initial absorption or transport of digested fats.
C. Lymphatic circulation:
Fats are absorbed in the intestines as chylomicrons and transported first through the lymphatic system, then eventually enter the bloodstream.
D. The pancreas:
The pancreas secretes enzymes (like lipase) to help digest fats, but it is not involved in the transport of absorbed fats.
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