Endocrinology/CaHomeostasis/BloodCaandPTH

提供:一歩一歩
2019年6月11日 (火) 17:09時点におけるSHolroydAtWeilCornellMedQatar (トーク | 投稿記録)による版 (ページの作成:「{{Point|When blood calcium levels rise, PTH levels decrease, this returns calcium levels back to normal. When blood calcium levels drop, PTH levels increase, this return...」)
(差分) ← 古い版 | 最新版 (差分) | 新しい版 → (差分)
ナビゲーションに移動 検索に移動
POINT!

The effect of blood calcium levels on parathyroid hormone (PTH) secretion

CaandPTH1.jpg

During hypercalcemia you are observing the same response as what you would see with excessive PTH release. The rules of negative feedback tell us therefore that hypercalcemia will lead to an inhibition of PTH formation and secretion, decreasing PTH blood levels which in turn will bring Ca2+ levels back to normal.

Link to video explanation

ICaandPTH2.jpg

During hypocalcemia you are observing the opposite response to what you would see with excessive release of PTH. The rules of negative feedback tell us therefore that hypocalcemia will lead to a stimulation of PTH formation and secretion, increasing PTH blood levels which in turn will bring Ca2+ levels back to normal.

PTH levels in the blood are controlled by blood Ca2+ levels in the following manner.

ICaandPTH3.jpg

Challenge Quiz

You must wait for the CORRECT! 正確!

<GIFT> //LEVEL:2 //RAND With respect to the negative feedback control, the secretion of parathyroid hormone is adjusted by: {=It’s physiological effect ~It’s blood concentration}

//LEVEL:2 //RAND Hypercalcemia indicates a(n) {=Elevated~Depressed} blood calcium concentration. This is the {=Same~Opposite} as/of the response to parathyroid hormone. The response of the parathyroid gland to hypercalcemia is to {Increase~=Decrease} PTH synthesis and release.


//LEVEL:2 //RAND Hypocalcemia indicates a(n) {Elevated~=Depressed} blood calcium concentration. This is the {Same~=Opposite} as/of the response to parathyroid hormone. The response of the parathyroid gland to hypercalcemia is to {=Increase~Decrease} PTH synthesis and release.

//LEVEL:2 //RAND A decrease in blood levels of parathyroid hormone will cause blood calcium levels to {Increase~=Decrease}

//LEVEL:2 //RAND An increase in blood levels of parathyroid hormone will cause blood calcium levels to {=Increase~Decrease}