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

The Nephron

Anatomy & Physiology

25. The Urinary System

The Nephron

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Multiple Choice

Most water is reabsorbed from the filtrate by which region of the nephron?

Proximal convoluted tubule

Collecting duct

Loop of Henle

Distal convoluted tubule

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Verified step by step guidance

Begin by understanding the function of each region of the nephron in the process of reabsorption. The nephron is the functional unit of the kidney responsible for filtering blood and forming urine.

The proximal convoluted tubule (PCT) is the first segment of the nephron where most reabsorption occurs. It reabsorbs approximately 65-70% of the water, sodium, and other solutes from the filtrate.

The Loop of Henle, particularly its descending limb, is permeable to water and allows for further reabsorption, but it is not the primary site for water reabsorption.

The distal convoluted tubule (DCT) and the collecting duct are involved in the fine-tuning of water and solute reabsorption, influenced by hormones like aldosterone and antidiuretic hormone (ADH). However, they do not reabsorb the majority of water.

Conclude that the proximal convoluted tubule is the region where most water is reabsorbed from the filtrate, making it the correct answer to the problem.