Concept explainers
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ANATOMY & PHYSIOLOGY: THE UNITY OF FORM
- Name the phenomenon of removal of urea as excretory product.arrow_forwardWhich statement about nitrogenous wastes is true? ammonia cannot be concentrated as much as urea and uric acid because it is more toxic some vertebrates are able to avoid producing nitrogenous wastes by using only anaerobic respiration most vertebrates that produce urea excrete the urea as salt crystals that have precipitated out of solution to conserve water many saurapsids excrete their nitrogenous wastes as nitric oxide All of these are correctarrow_forwardProteus mirabilis produces the enzyme grease, which converts urea into ammonia. Explain why patients with a UTI caused by proteus mirabilis would have a higher than normal urine PHarrow_forward
- If only a very small amount of urea were present in the interstitial fluid of the kidney instead of its normal concentration, how would it affect the kidney's ability to concentrate urine? asaparrow_forwardState the implication of a high value of NPN in blood and urine. What does the amount of urea, ammonia, and creatinine in the urine tell us about renal function? Which food substances can lead to an increased value of NPN in the blood?arrow_forwardName the condition in which there is presence of sugar in urine.arrow_forward
- A friend who is enthusiastic about health foods and organic gardening asks you whether urea is “organic” or “chemical.” How do you reply to this question?arrow_forward///;($&(;;;;arrow_forwardIn general terms, explain the role in insects of the malpighian tubules and rectum in conserving water, ions, and amino acids and removing nitrogen waste.arrow_forward
- A man fed a low protein-high carbohydrate diet excreted 6.2 grams of urea per day. After three days 16. without food, the same man excreted 26.2 grams of urea per day. Explain these data.arrow_forwardDescribe how the urea cycle is activated after ahigh-protein meal.arrow_forwardThe concentration of urea in urine is always much higher than the concentration in plasma. Does this mean that urea is secreted? Hint: remember that concentration is a ratio.arrow_forward