10:25:11 - Phosphorus, Magnesium Water

10:25:11 - Phosphorus, Magnesium Water - Phosphorus Second...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Phosphorus Second most prevalent mineral in the human body. Approximately: 560 860 g or 0.8 1.2% of body wieght. 85% is in the skeleton 14% in soft tissue 1% in the blood Commonly found in combination with other elements. Sources Widely found in food: meat, poultry, fish, eggs, milk, milk products, nuts, legumes, grains and cereals. Coffee, tea and soda provide small amounts. Found in foods in various forms: organic, inorganic, in combination influences absorption. DRI mg/day 1-3 460 4-8 500 Males 9 18 1250 19 - >70 700 Females 9 -18 1250 19 - >70 700 Digestion and Absorption Most Ph is absorbed in its inorganic form. 2 zinc-dependent enzymes (Phospholipase C and Alkaline Phosphatase) works at brush border to free most phosphorus The body is limited in the amount of phosphorus that can be released from phytates ( only about 50% is absorbed). Generally 50-70% of dietary phosphorus is absorbed. Absorption occurs in the duodenum and jejunum. Absorbed by 2 processes: 1)sodium-dependent active carrier enhanced by calcitriol. 2)Concentration dependent facilitative diffusion process. *** most phosphorus absorbed this way. If intake is low then active transport increases. Factors influencing absorption: Stimulate: 1)Calcitriol - VD Inhibit: 1)Phytate 2)Magnesium 3)Aluminum 4)Calcium Common antacids: aluminum hydroxide, magnesium hydroxide, calcium carbonate or calcium acetate will bind phosphorus to prevent absorption. Excessive intake Transport 70% found as phospholipids (lipoproteins) 30% as HPO 4 2-, H 2 PO 4 , or PO 4 3-osphorus is found in all cells of the body and tends to be kept in balance: Skeletal - Cellular inorganic - organic phosphates formed as intermediaries in the blood Functions Bone mineralization 85% of body phosphorus is found in bone. found bound to calcium in a variety of forms. regulated by PTH, calcitriol and calcitonin PTH In response to Ca levels bone resorption which s serum P will also excretion of P by the kidney Calcitriol In response to Ca levels bone resorption which s serum P will stimulate P absorption in GI tract Calcitonin In response to Ca levels bone mineralization that s serum P Functions continued 1) Bone mineralization 2) Nucleotide/nucleoside phosphates structural component of DNR and RNA Energy storage and transfer ATP, UTP...
View Full Document

Page1 / 31

10:25:11 - Phosphorus, Magnesium Water - Phosphorus Second...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online