calcium

Question 1

how can calcium be absorbed into the body?

Answer 1

through active transport and passive diffusion.

Question 2

how is it absorbed through active transport?

Answer 2

SATURATED. Regulated by the dietary intake and the body’s needs -Brush border, calcium channels and CA binding protein -Diffusion across cytoplasm-Secretion into ECF by the Ca-ATPase pump

Question 3

how is it absorbed through passive diffusion?

Answer 3

Not saturated, high intakes Ca means more into the body -Affected by dietary factors -Promoters – Protein, AA, Lactose, Acidic gut -Inhibitors – Oxalate, Phosphorus, Phytate

Question 4

what does our body do with excess calcium?

Answer 4

we do not store it, it is excreted through our urine, feaces and sweat.

Question 5

functions of calcium.

Answer 5

Intracellular messenger -Bone = 99 % body calcium, structural role in skeleton, physiological role in reservoir of essential minerals

Question 6

bioavailability of calcium.

Answer 6

Bioavailability = proportion of a nutrient that is absorbed, utilised and available to the body. Calcium lysinate is more bioavailable form of calcium.

Question 7

calcium deficiency.

Answer 7

Children have decreased growth and decreased bone mass-Adults have decreased bone mass -Bone healthy diet, dairy or fortified replacement, moderate protein, and low sodium-Bone loss osteoporosis prevention high calcium intake and vitamin D, consequences long term health issue bone fracture

Question 8

RDI of calcium vs what we have

Answer 8

1000mg/day
M(919/day) W(745/DAY)