Phosphorus revision - week 11

Question 1

Food source

Answer 1

milk, milk products, processed foods, fish, soft drinks, bakery products, meats

Question 2

Absorption

Answer 2

• In upper SI
• 70% dietary source absorbed
• active transport and diffusion
• calcitriol enhances absorption
• Phos. From grains/legumes poort absorbed because present phytate phosphorus (lack adequate enzyme to free it from phytate)

Question 3

Storage

Answer 3

• 80-85% found in bones and teeth as hydroxyapatite

- rest in other cells and ECF

Question 4

excretion

Answer 4

urine

Question 5

main function

Answer 5

• Major ion of intracellular fluid
• Bone and teeth strength
• Parts of ATP and other metabolic compounds, acid-base balance

Question 6

RDI

Answer 6

1g

Question 7

UL

Answer 7

3-4g

Question 8

toxicity

Answer 8

• Hyperphosphateaemia
• Impairs bone health in people with kidney failure
• Poor bone mineralization if calcium intakes are low

Question 9

deficiency

Answer 9

• Hypophosphateaemia

- Possibility of poor bone maintenance