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Chapter: Medical Physiology: Dietary Balances; Regulation of Feeding; Obesity and Starvation; Vitamins and Minerals

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Vitamin K

Vitamin K is necessary for the formation by the liver of prothrombin, Factor VII (proconvertin), Factor IX, and Factor X, all of which are important in blood coagulation.

Vitamin K

Vitamin K is necessary for the formation by the liver of prothrombin, Factor VII (proconvertin), Factor IX, and Factor X, all of which are important in blood coagulation. Therefore, when vitamin K deficiency occurs, blood clotting is retarded.

Several compounds, both natural and synthetic, exhibit vitamin K activity. Because vitamin K is synthe-sized by bacteria in the colon, it is rare for a person to have a bleeding tendency because of vitamin K defi-ciency in the diet. However, when the bacteria of the colon are destroyed by the administration of large quan-tities of antibiotic drugs, vitamin K deficiency occurs rapidly because of the paucity of this compound in the normal diet.


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