Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

25. The Urinary System

Introduction to the Urinary System

Anatomy & Physiology

25. The Urinary System

Introduction to the Urinary System

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Multiple Choice

Fluid arriving at the distal convoluted tubule (DCT) contains about how much water from the original glomerular filtrate?

About 20%

About 5%

About 80%

About 50%

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Verified step by step guidance

Understand the role of the distal convoluted tubule (DCT) in the nephron: The DCT is part of the kidney's filtration system, where fine-tuning of water and solute reabsorption occurs. By the time fluid reaches the DCT, most of the water has already been reabsorbed in earlier parts of the nephron, such as the proximal convoluted tubule and the loop of Henle.

Recall the approximate percentage of water reabsorbed in the nephron: About 65-70% of water is reabsorbed in the proximal convoluted tubule, and an additional 15-20% is reabsorbed in the loop of Henle. This leaves only a small percentage of the original glomerular filtrate water reaching the DCT.

Analyze the options provided: The percentages listed (20%, 5%, 80%, 50%) represent possible amounts of water remaining from the original glomerular filtrate. Based on the reabsorption rates, the correct answer should reflect the small amount of water left after the majority has been reabsorbed.

Eliminate incorrect options: About 80% and About 50% are too high, as most water has already been reabsorbed before reaching the DCT. About 5% is a plausible answer, as it aligns with the small percentage of water remaining.

Conclude the reasoning: The fluid arriving at the DCT contains approximately 5% of the original glomerular filtrate water, based on the cumulative reabsorption that occurs in the nephron prior to this point.