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| 61. | specific gravity | weight of a liquid compared to pure water, which has a specific gravity of 1.0; any solute added to water will increase its specific gravity |
| 62. | systemic edema | increased fluid retention in the interstitial spaces and cells of the body; can be seen as swelling over large areas of the body, particularly the lower extremities |
| 63. | trigone | area at the base of the bladder marked by the two ureters in the posterior-lateral aspect and the urethral orifice in the anterior aspect oriented like points on a triangle |
| 64. | tubuloglomerular feedback | feedback mechanism involving the JGA; macula densa cells monitor Na+ concentration in the terminal portion of the ascending loop of Henle and act to cause vasoconstriction or vasodilation of afferent and efferent arterioles to alter GFR |
| 65. | urethra | transports urine from the bladder to the outside environment |
| 66. | urinalysis | analysis of urine to diagnose disease |
| 67. | urochrome | heme-derived pigment that imparts the typical yellow color of urine |
| 68. | vasa recta | branches of the efferent arterioles that parallel the course of the loops of Henle and are continuous with the peritubular capillaries; with the glomerulus, form a portal system |
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