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

Which region of the nephron is responsible for reabsorbing approximately 65% of the filtrate volume?

Collecting duct

Loop of Henle

Proximal convoluted tubule

Distal convoluted tubule

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Verified step by step guidance

Step 1: Understand the nephron's structure and function. The nephron is the functional unit of the kidney, responsible for filtering blood and forming urine. It consists of several regions, including the proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct.

Step 2: Learn the role of the proximal convoluted tubule. This region is the first segment of the nephron after the glomerulus and is responsible for reabsorbing the majority of the filtrate volume, approximately 65%. It reabsorbs water, ions (such as sodium and chloride), glucose, and amino acids back into the bloodstream.

Step 3: Compare the functions of other nephron regions. The loop of Henle primarily concentrates urine by reabsorbing water and salts. The distal convoluted tubule fine-tunes ion and water reabsorption under hormonal control. The collecting duct is involved in the final adjustments of water and solute reabsorption.

Step 4: Eliminate incorrect options based on their functions. The collecting duct, loop of Henle, and distal convoluted tubule do not reabsorb 65% of the filtrate volume. Their roles are more specialized and occur later in the nephron process.

Step 5: Conclude that the proximal convoluted tubule is the correct answer, as it is the region responsible for reabsorbing approximately 65% of the filtrate volume.