Phosphorus

Question 1

We consume and use P as:

Answer 1

PO4 -3 (Pi)–>inorganic phosphate

Question 2

recommended dietary lvls are given as:

Answer 2

mgP

Question 3

85% P found in ___, 15% in ___

Answer 3

bone; soft tissues (bound to many cules)–>regulatory

Question 4

passive absorption through ___ has a ___% efficiency

Answer 4

diffusion; 70

Question 5

___ absorption is ____ mediated, and has ___% efficiency

Answer 5

active; 1,25; 90

Question 6

phosphates are dangerous for people with ___ failure

Answer 6

renal

Question 7

This form is poorly digested, found in plant cell walls

Answer 7

phytate

Question 8

active absorption of P is initiated by the _____ cotransporter

Answer 8

sodium phosphate (enhanced by calcitriol)

Question 9

This substance enhances absorption of P

Answer 9

vitamin D

Question 10

these substances inhibit absorption of P (we WANT this)

Answer 10

Mg, Ca, Al

Question 11

What is the RDA of P?

Answer 11

700mg

Question 12

what are food sources of P?

Answer 12

stuff with protein (meat, dairy, legumes, grains), additives for powdered foods and colas

Question 13

The P in ___ is poorly absorbed

Answer 13

phytate

Question 14

^1,25 causes ___ absorption of Pi

Answer 14

increased

Question 15

PTH ____ urinary losses of Pi and bone losses of both Ca and Pi

Answer 15

increases (contrast from Ca)

Question 16

what is the UL?

Answer 16

4000mg (elevated serum P–>bone loss, kidney failure)

Question 17

RDA for Mg?

Answer 17

400 mg for males, 310 mg for females

Question 18

what are some functions of Mg in body

Answer 18

bone, enzyme function, CNS

Question 19

What is the best food source of Mg?

Answer 19

legumes (back beans)

Question 20

channel for Mg in enterocyte is called ___ and channel for Ca is called ___

Answer 20

TRVM6; TRPV6

Question 21

substances that enhance absorption of Mg?

Answer 21

Vitamin D, Protein, Carbs, Fructose, inulin (fermentable fibre)

Question 22

substances that inhibit absorption of Mg?

Answer 22

phytic acid, fibre, f.a.

Question 23

symptoms of this include insomnia, tremors, leg cramps

Answer 23

hypomagnesemia

Question 24

symptoms of this include lethargy that leads to a coma

Answer 24

hypermagnesemia

Question 25

Mg ___ w/ Ca in absorption, Mg ____ w/ Ca in plasma lvls, Mg ___ w/ Ca in intracellular

Answer 25

competes; complements; competes

Question 26

Mg __ contraction of muscle, Ca ___ contraction

Answer 26

inhibits; causes

Question 27

Mg causes ___, Ca causes ___

Answer 27

diarrhea; constipation

Question 28

Mg ___ coagulation while Ca ___ coagulation

Answer 28

decreases; increases

Question 29

UL is based on ___ intake; it is set at ___mg

Answer 29

acute (as a drug); 350

Question 30

MgSO4 is ___, causing ^ GI transit time

Answer 30

cathartic