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5. Beta-carotene is called provitamin A, meaning it is: stored as is by the liver. more...
Multiple choice questions. Need answers asap. Human nutrition When you enter a dark room from a brightly lit area; a) Vision is poor until retinol is oxidized to all trans retinal b) Vision will be optimal for the first 15 seconds, and then rhodopsin will degrade under the low-light conditions c) Vision is poor until opsin can be synthesized d) Vision is poor until significant levels of opsin and 11-cis retinal bind together It is safer to consume large amounts...
Case 2: An 88-year-old woman was seen by an ophthalmologist at an eye clinic in Toronto, complaining about itchy, burning eyes. An examination of the cornea revealed dry patches on the surface of the eye, consistent with xeropthalmia. The patient reported having food intolerances for the last 20 years and following a strict "diet" consisting of rice, canned tuna and vitamin B supplements. Serum retinol levels were found to be extremely low. The doctors prescribed megadoses of vitamin A which...