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explain the deficiency and toxicity of vitamin awho defines vad as tissue concentrations of vitamin a low enough to have adverse health consequences
define role in protein metabolism and growthsevere vitamin a deficiency results in abnormal rna metabolism and protein synthesis and hence interferes
determine the role as antioxidantsome carotenoids in addition to serving as a source of vitamin a have been shown lo function as antioxidants studies
define integrity of epithelial tissuesvitamin a is essential for the integrity of the mucous-secreting cells in fact vitamin a maintains the health
define the role of vitamin a in immune responsevitamins a is essential to normal immune function and- regulation as discussed above during vitamin a
define role in growth and cellular differentiationthe growth and differentiation of epithelial cells throughout the body are especially affected by
define the functions of vitamin avitamin a retinol is an essential nutrient needed in small amounts by humans for the normal functioning of the
define factors influencing the efficiency of bioconversion amount of provitamin a presented to the cell differential conversion by stereoisomeric
define factors influencing uptake from lumen to intestinal cells inhibition by intrinsic matrix inhibition by dietary fiber sources
explain the storage of vitamin athe primary organ for storage of vitamin a is the liver reserves are found in the stellate cells as mentioned above
explain the transportation of vitamin athe chylomicra and retinal-binding protein play an important role in the transport of retiuol this chylomicra
explain transport and utilization of vitamin athe efficacy of the intestines to facilitate absorption and utilization of retinoid s and carotenoids
define the absorption of vitamin avitamin a and carotenoid tend to aggregate with lipids into globules which then pass into the small intestine
define requirements and recommended dietary allowances rdawhat do we mean by requirements and rda the requirement level is the amount of nutrient
define the bioavailability of vitaminsthe term bio availability refers to the overall efficiency of utilization including physiological and
define absorption storage and elimination of vitamins reading through this section you would realize that all fat-soluble vitamins undergo similar
what are fat soluble vitamins as we already know there are four fat-soluble vitamins - a d e and k the presence of fat is required for the
explain about the importance of vitaminsvitamins are the organic substances that act as coenzyme andor regulator of metabolic processes there are 13
why water is a essential nutrient for lifein this unit we learnt that water in spite of being ignored is an essential nutrient required for life
what is the meaning of oedemain some pathological conditions the body is in a positive water balance that is the intake of fluids is greater than the
determine the symptoms of dehydrationthe symptoms of dehydration are thirst loss of appetite decreased urination impaired physical performance
explain about the dehydrationdehydration is defined as the excessive loss of body water it may occur because of inadequate intake or abnormal loss of
define the disturbances in fluid balancethe correct functioning of cells and tissues depends on appropriate concentrations of nutrients so any
define the requirements for waterthe body has no provision for water storage therefore the amount of water lost every 24 hours must be replaced to
how thirst and satiety influence water intakethirst and satiety influence water intake apparently in response to changes sensed by the mouth