threshold substance

thresh·old sub·stance

any material (for example, glucose) that is excreted in the urine only when its plasma concentration exceeds a certain value, termed its threshold. Synonym(s): threshold body

thresh·old sub·stance

(thresh'ōld sub'stăns) Any material (e.g., glucose) that is excreted in the urine only when its plasma concentration exceeds a certain value, termed its threshold.

threshold substance

A substance present in the blood that, on being filtered through glomeruli of the kidney, is reabsorbed by the tubules up to a certain limit, that being the upper limit of the concentration of the substance in normal plasma. High-threshold substances (such as chlorides or glucose) are entirely or almost entirely reabsorbed. Low-threshold substances (such as phosphates or urea) are reabsorbed in limited quantities. No-threshold substances (such as creatinine sulfate) are excreted entirely.

单词	threshold substance
释义	threshold substance thresh·old sub·stance any material (for example, glucose) that is excreted in the urine only when its plasma concentration exceeds a certain value, termed its threshold. Synonym(s): threshold body thresh·old sub·stance (thresh'ōld sub'stăns) Any material (e.g., glucose) that is excreted in the urine only when its plasma concentration exceeds a certain value, termed its threshold. threshold substance A substance present in the blood that, on being filtered through glomeruli of the kidney, is reabsorbed by the tubules up to a certain limit, that being the upper limit of the concentration of the substance in normal plasma. High-threshold substances (such as chlorides or glucose) are entirely or almost entirely reabsorbed. Low-threshold substances (such as phosphates or urea) are reabsorbed in limited quantities. No-threshold substances (such as creatinine sulfate) are excreted entirely.
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