Magnesium and Sulfur Flashcards
what % of the body supply of magnesium is in the skeleton?
~70%
What % of magnesium is distributed in body fluids and tissues
30%
distribution of magnesium in the blood
2-3mg/100ml
about _____ of skeletal Mg++ can be mobilized to blood in case of reduced dietary supply
1/3
3 Main functions of Magnesium
- bone formation
- enzyme activator
- helps reduce nerve irritability
absorption site of magnesium
small intestine for all animals and also the rumen of ruminants
mechanism of Mg absorption
active transport of soluble Mg salts
consequences of Mg deficiency
- low blood Mg = vasodialation, hyper-irritability, convulaions and death
- grass tetany (hypomagnesemia) - common occurrence in cows and ewes turned on lush pasture in spring
grass tetany is characterized by:
low Mg level in blood, nervousness, loss of appetite, trembling, convulsions, coma, death
Rx=
Ca/Mg gluconate
Body contains what % sulfur
0.15%
most sulfur is bound organically in protein, primarily in the sulfur containing amino acids _________ and __________
cystine and methionine
Of the total sulfur in blood, most is present in the free amino acids,______ and _____ and in the ______ _______
CYS and MET
plasma proteins
of the total sulfur in blood, a small amount is present as the inorganic sulfate ion _____
SO4
of the total sulfur in blood, another portion is present in various organic compounds such as _____ and ______
insulin and glutathione
some sulfur is present in the vitamins
thiamin and biotin
sulfur is present in chondroitin sulfate which is a constituent of
cartilage
*From the sulfur present in the body, it can be seen that sulfur nutrition is primarily a matter of _____ _____ _______
amino acid nutrition
absorption of sulfur primarily occurs in the
small intestine
sulfur is normally absorbed in the organic form as
the AA cystine and methionine
sulfur is excreted where
in feces and urine
Sulfur excretion via urine consist of
1) inorganic sulfate
2) ethereal sulfur
3) neutral sulfur
sulfur excretion via feces consist of
organic sulfur (amino acids)
additional sulfur may prove beneficial for microbial synthesis of the sulfur containing amino acids in what case?
when using NPN (EG, UREA) for ruminants
we never have to consider sulfur when feeding natural proteins to ruminants due to
high content of sulfur containing amino acids
