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

Renal Physiology: Overview

Anatomy & Physiology

25. The Urinary System

Renal Physiology: Overview

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

During reabsorption in the nephron, water moves from the descending limb of the nephron loop into which structure?

the collecting duct

the glomerular capsule

the proximal convoluted tubule

the surrounding interstitial fluid

Previous problemNext problem

Verified step by step guidance

Understand the anatomy of the nephron: The nephron is the functional unit of the kidney, responsible for filtering blood and forming urine. It consists of several structures, including the glomerular capsule, proximal convoluted tubule, nephron loop (loop of Henle), distal convoluted tubule, and collecting duct.

Focus on the nephron loop: The nephron loop has two limbs—descending and ascending. The descending limb is permeable to water but not to solutes, allowing water to move out into the surrounding interstitial fluid.

Explain the role of the interstitial fluid: The interstitial fluid surrounding the nephron loop has a high osmolarity due to the active transport of solutes in the ascending limb. This creates a concentration gradient that drives water reabsorption from the descending limb into the interstitial fluid via osmosis.

Clarify why the other options are incorrect: Water does not move into the collecting duct, glomerular capsule, or proximal convoluted tubule during this specific process. The collecting duct is involved in later stages of water reabsorption, while the glomerular capsule is where filtration occurs, and the proximal convoluted tubule is involved in reabsorbing solutes and water earlier in the nephron.

Summarize the process: During reabsorption in the nephron, water moves from the descending limb of the nephron loop into the surrounding interstitial fluid due to the osmotic gradient created by solute concentration in the interstitial space.