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Questions and Answers
What is the principal role of vitamin K in the body?
What is the principal role of vitamin K in the body?
- To assist in the posttranslational modification of blood clotting factors (correct)
- To serve as an antioxidant
- To regulate calcium levels in the bones
- To promote cell growth and repair
Which form of vitamin K is found in plants?
Which form of vitamin K is found in plants?
- Phylloquinone (correct)
- Menaquinone
- Ergocalciferol
- Menadione
Which blood clotting factor is NOT influenced by vitamin K?
Which blood clotting factor is NOT influenced by vitamin K?
- Factor X
- Factor VII
- Factor V (correct)
- Factor II
Where is menaquinone primarily found?
Where is menaquinone primarily found?
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What synthetic form of vitamin K is available for use?
What synthetic form of vitamin K is available for use?
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Study Notes
Vitamin K Forms
- Vitamin K exists in multiple forms
- Phylloquinone (Vitamin K1) is found in plants
- Menaquinone (Vitamin K2) is found in intestinal bacterial flora
- Menadione is a synthetic form of vitamin K
Function of Vitamin K
- Vitamin K is a coenzyme in the posttranslational modification of blood clotting factors
- It is required for the carboxylation of certain glutamic acid residues in these proteins
- Vitamin K is necessary for the hepatic synthesis of prothrombin and blood clotting factors II, VII, IX, and X
- It aids in the formation of γ-carboxyglutamate (Gla)
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