BIOLOGY: CONCEPTS AND INVESTIGATIONS,
5th Edition
ISBN: 9781266382307
Author: Hoefnagels
Publisher: MCG
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Chapter 33, Problem 5WIO
Summary Introduction
To explain:
The reason why exercise increases the urea concentration in urine.
Concept introduction:
Excretion is the process in which the metabolic and toxic wastes are removed from the body through urine. Kidneys play a crucial in the removal of toxins from the body as the filtration process takes place in the functional unit nephrons of the kidneys.
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Explain why exercise increases the urea concentration in urine.
The 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.
Explain why even a severely dehydrated person inevitablyexperiences further fluid loss.
Chapter 33 Solutions
BIOLOGY: CONCEPTS AND INVESTIGATIONS,
Ch. 33.1 - Prob. 1MCCh. 33.1 - Prob. 2MCCh. 33.1 - Prob. 3MCCh. 33.2 - What is osmoregulation, and why is it important?Ch. 33.2 - Prob. 2MCCh. 33.2 - Prob. 3MCCh. 33.3 - Prob. 1MCCh. 33.3 - Prob. 2MCCh. 33.4 - Prob. 1MCCh. 33.4 - Prob. 2MC
Ch. 33.5 - What three processes occur in urine formation?Ch. 33.5 - Prob. 2MCCh. 33.5 - Describe the roles of antidiuretic hormone and...Ch. 33.6 - Prob. 1MCCh. 33.6 - Prob. 2MCCh. 33 - Prob. 1MCQCh. 33 - Prob. 2MCQCh. 33 - Prob. 3MCQCh. 33 - Prob. 4MCQCh. 33 - Prob. 5MCQCh. 33 - Which of the following components of glomerular...Ch. 33 - Prob. 7MCQCh. 33 - Prob. 1WIOCh. 33 - Prob. 2WIOCh. 33 - Prob. 3WIOCh. 33 - Prob. 4WIOCh. 33 - Prob. 5WIOCh. 33 - Prob. 6WIOCh. 33 - How does the kidney reduce the volume of urine to...Ch. 33 - Prob. 8WIOCh. 33 - Prob. 1PITCh. 33 - Prob. 2PITCh. 33 - Prob. 3PIT
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- Explain how the kidneys help to maintain the balance of acids and bases in extracellular fluid.arrow_forwardExplain what happens to Na+ concentration in the nephron when GFR increases.arrow_forwardWrestlers often fast and dehydrate to stay in a specific weight class. What abnormal urine values may be shown during the urinalysis of a wrestler? Explain.arrow_forward
- Explain how urine has a pH ~6, and contains little to no bicarbonate? Please provide a thorough explanationarrow_forwardIf 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_forwardExplain why not reabsorbing bicarbonate (HCO3-) and Glucose lead to acidosis and polyuria (respectively).arrow_forward
- After about 6 weeks of fasting, the production of urea isdecreased. Explain.arrow_forwardGiven: For urea, the rate of excretion equals to the GFR times the urea concentration in plasma. (A) If the urea concentration in plasma is 4.5 mmol/l, what GFR (in l/day) would correspond to an excretion rate of 450 mmol/day. (B) If the urea clearance is 70 ml/min and the GFR is 125 ml/min, what fraction of urea is being reabsorbed. (answer A and B)arrow_forwardif An athlete has just finished an intensive sport session during which he sweated excessively and forgot to drink water. Explain how this is expected to affect his urine concentrationarrow_forward
- Why is glucose normally absent from the urine?arrow_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_forwardg. What constituent of urine tends to precipitate in acidic urine? h. What substance precipitates when urine is alkaline?arrow_forward
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