Urea is
A) actively transported into the filtrate by the cells of the collecting duct.
B) completely eliminated in the urine.
C) passively reabsorbed in the proximal tubule.
D) actively secreted in the distal tubule.
E) actively reabsorbed in the proximal tubule.
C) passively reabsorbed in the proximal tubule.
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A 25-year-old woman visits her obstetrician one year after a normal pregnancy and vaginal delivery of healthy twins. Following a physical examination, the physician informs the woman she is in good health and that all postnatal conditions are occurring as they should. At this time, the medial umbilical folds contain which of the following structures?
(A) Obliterated umbilical vein (B) Obliteratedurachus (C) Obliterated umbilical arteries (D) Obliterated ductus venosus (E) Obliterated inferior epigastric vessels
The maintenance of normal volume and composition of extracellular and intracellular fluids is vital to life. List and briefly describe the kinds of homeostasis involved
Which of the following diseases result when the cells marked in the histology image are destroyed by the immune system?
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You conduct an experiment on twenty 18-year-old male subjects to see how various intensities of exercise influence heart rate. Which of the following is/are considered a dependent variable?
A) heart rate B) age of subjects C) sex of subjects D) intensity of exercise E) More than one of the answers is correct.