Lecture 22 Flashcards
increases of calcium ion above normal cause depression of, symptoms appear when blood levels rise above 12 mg/dl (constipation and not hungry)
nervous system
decreases in Ca concentration causes the nervous system to be more
excited
.1% of the total body Ca is stored in
extracellular fluid
1% of Ca is stored in
cells and organelles
98.9% of Ca is stored in the
bones
85% of total body phosphate is stored in the
bones
large changes in the level of phosphate in the body __ ___ cause major immediate effects on the body
do not
this occurs when blood concentrations of Ca fall from normal levels of 9.5 mg/dl to 6 mg/dl
tetany
blood Ca levels are lethal when they fall to
4 mg/dl
about what percent of ingested Ca is absorbed?
35%
what % of daily intake of Ca is excreted in the feces?
90%
what is an inhibitor of hydroxyapatite crystals?
pyrophosphate
the active form of vit. D is and causes increase in absorption of Ca
1,25-dihydroxycholecalciferol
1,25-dihydroxycholecalciferol increases the formation of what protein that functions to transport Ca into the cell cytoplasm
calbindin
excess activity of PTH causes absorption of Ca salts from the bones and results in _____ in the EC fluid
hypercalcemia