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 segment of the nephron loop is permeable to water?

Collecting duct

Ascending limb

Distal convoluted tubule

Descending limb

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Verified step by step guidance

Understand the structure of the nephron, which is the functional unit of the kidney. It consists of several segments, including the proximal convoluted tubule, nephron loop (loop of Henle), distal convoluted tubule, and collecting duct.

Identify the segments of the nephron loop: the descending limb and the ascending limb. Each has distinct properties regarding permeability to water and solutes.

Recall that the descending limb of the nephron loop is permeable to water but not to solutes. This allows water to be reabsorbed into the bloodstream, concentrating the urine.

Contrast this with the ascending limb, which is impermeable to water but actively transports ions like sodium and chloride out of the filtrate, further concentrating the urine.

Recognize that the distal convoluted tubule and collecting duct have different roles in reabsorption and secretion, but the descending limb is specifically known for its permeability to water.