Lecture 22 Flashcards

1
Q

increases of calcium ion above normal cause depression of, symptoms appear when blood levels rise above 12 mg/dl (constipation and not hungry)

A

nervous system

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2
Q

decreases in Ca concentration causes the nervous system to be more

A

excited

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3
Q

.1% of the total body Ca is stored in

A

extracellular fluid

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4
Q

1% of Ca is stored in

A

cells and organelles

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5
Q

98.9% of Ca is stored in the

A

bones

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6
Q

85% of total body phosphate is stored in the

A

bones

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7
Q

large changes in the level of phosphate in the body __ ___ cause major immediate effects on the body

A

do not

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8
Q

this occurs when blood concentrations of Ca fall from normal levels of 9.5 mg/dl to 6 mg/dl

A

tetany

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9
Q

blood Ca levels are lethal when they fall to

A

4 mg/dl

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10
Q

about what percent of ingested Ca is absorbed?

A

35%

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11
Q

what % of daily intake of Ca is excreted in the feces?

A

90%

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12
Q

what is an inhibitor of hydroxyapatite crystals?

A

pyrophosphate

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13
Q

the active form of vit. D is and causes increase in absorption of Ca

A

1,25-dihydroxycholecalciferol

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14
Q

1,25-dihydroxycholecalciferol increases the formation of what protein that functions to transport Ca into the cell cytoplasm

A

calbindin

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15
Q

excess activity of PTH causes absorption of Ca salts from the bones and results in _____ in the EC fluid

A

hypercalcemia

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16
Q

synthesis of PTH occurs in the __ and ___

A

ER and golgi

17
Q

3 examples of conditions that cause a decrease in Ca iron concentrations are:

A

rickets, pregnancy, and lactation

18
Q

excess Ca in diet, increased vit. D in diet and bone absorption

A

conditions that increase Ca ion concentration above normal

19
Q

this is a peptide hormone, secreted by the thyroid gland, tends to decrease plasma Ca conc.

A

calcitonin

20
Q

this occurs when parathyroid glands do not secrete sufficient PTH

A

hypoparathyroidism