The best swimmers among female Ironman triathletes complete the swimming portion of the event in 50 minutes to an hour. At the World Championship, the cutoff time for all competitors is two hours, 20 minutes. Any participant who fails to complete the 2.2-mile swim within that time is eliminated from the competition.
Vitamin K: One of two naturally occurring fat-soluble vitamins (vitamin K1 and vitamin K2) needed for the clotting of blood because of an essential role in the production of prothrombin (a clotting factor).
Overview. Vitamins are essential molecules that must be taken in from the diet because the human body is incapable of synthesizing them. Water-soluble vitamins are absorbed in the upper small intestine.Bacteria in the large intestine synthesize many water-soluble vitamins; however lower intestinal bacterial synthesis of vitamins is not a major source of vitamins for humans.verview. Vitamins are essential molecules that must be taken in from the diet because the human body is incapable of synthesizing them. Water-soluble vitamins are absorbed in the upper small intestine.