Magnesium and Sulfur

Question 1

what % of the body supply of magnesium is in the skeleton?

Answer 1

~70%

Question 2

What % of magnesium is distributed in body fluids and tissues

Answer 2

30%

Question 3

distribution of magnesium in the blood

Answer 3

2-3mg/100ml

Question 4

about _____ of skeletal Mg++ can be mobilized to blood in case of reduced dietary supply

Answer 4

1/3

Question 5

3 Main functions of Magnesium

Answer 5

1. bone formation
2. enzyme activator
3. helps reduce nerve irritability

Question 6

absorption site of magnesium

Answer 6

small intestine for all animals and also the rumen of ruminants

Question 7

mechanism of Mg absorption

Answer 7

active transport of soluble Mg salts

Question 8

consequences of Mg deficiency

Answer 8

1. low blood Mg = vasodialation, hyper-irritability, convulaions and death
2. grass tetany (hypomagnesemia) - common occurrence in cows and ewes turned on lush pasture in spring

Question 9

grass tetany is characterized by:

Answer 9

low Mg level in blood, nervousness, loss of appetite, trembling, convulsions, coma, death

Question 10

Rx=

Answer 10

Ca/Mg gluconate

Question 11

Body contains what % sulfur

Answer 11

0.15%

Question 12

most sulfur is bound organically in protein, primarily in the sulfur containing amino acids _________ and __________

Answer 12

cystine and methionine

Question 13

Of the total sulfur in blood, most is present in the free amino acids,______ and _____ and in the ______ _______

Answer 13

CYS and MET

plasma proteins

Question 14

of the total sulfur in blood, a small amount is present as the inorganic sulfate ion _____

Answer 14

SO4

Question 15

of the total sulfur in blood, another portion is present in various organic compounds such as _____ and ______

Answer 15

insulin and glutathione

Question 16

some sulfur is present in the vitamins

Answer 16

thiamin and biotin

Question 17

sulfur is present in chondroitin sulfate which is a constituent of

Answer 17

cartilage

Question 18

*From the sulfur present in the body, it can be seen that sulfur nutrition is primarily a matter of _____ _____ _______

Answer 18

amino acid nutrition

Question 19

absorption of sulfur primarily occurs in the

Answer 19

small intestine

Question 20

sulfur is normally absorbed in the organic form as

Answer 20

the AA cystine and methionine

Question 21

sulfur is excreted where

Answer 21

in feces and urine

Question 22

Sulfur excretion via urine consist of

Answer 22

1) inorganic sulfate
2) ethereal sulfur
3) neutral sulfur

Question 23

sulfur excretion via feces consist of

Answer 23

organic sulfur (amino acids)

Question 24

additional sulfur may prove beneficial for microbial synthesis of the sulfur containing amino acids in what case?

Answer 24

when using NPN (EG, UREA) for ruminants

Question 25

we never have to consider sulfur when feeding natural proteins to ruminants due to

Answer 25

high content of sulfur containing amino acids