Which vitamin is important for collagen production and immunity?
Vitamin D
Vitamin K
Vitamin C
Vitamin A
The Correct Answer is C
A. Vitamin D: Important for calcium/phosphate balance and has immune roles, but it is not the key vitamin for collagen synthesis.
B. Vitamin K: Required for activation of clotting factors and some bone proteins, not directly for collagen production.
C. Vitamin C: Essential as a cofactor for proline and lysine hydroxylation during collagen synthesis and supports immune function; deficiency impairs collagen formation.
D. Vitamin A: Important for vision, epithelial health, and immune function, but not directly required for collagen hydroxylation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Calcium (Ca⁺): This mineral plays roles in bone strength, muscle contraction, and clotting but is not involved in oxygen binding in hemoglobin.
B. Sodium (Na⁺): Sodium helps regulate fluid balance and nerve signaling, but it does not participate in oxygen transport.
C. Iron (Fe⁺): Iron within the heme groups of hemoglobin binds reversibly with oxygen, allowing red blood cells to transport it throughout the body.
D. Potassium (K⁺): Potassium maintains cell membrane potential and nerve conduction, not oxygen binding.
Correct Answer is C
Explanation
A. Liver: Produces many plasma proteins and has immune roles, but it is not classified as a primary lymphatic organ.
B. Parotid glands: Major salivary (exocrine) glands that produce saliva, not components of the lymphatic system.
C. Spleen: A lymphatic organ that filters blood, removes old red cells, and participates in immune responses.
D. Pancreas: An endocrine and exocrine gland that regulates glucose and secretes digestive enzymes, not a lymphatic organ.
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