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

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Multiple Choice

Most electrolyte reabsorption by the renal tubules is ________.

dependent on secretion in the distal convoluted tubule

regulated by the glomerulus

a function of the proximal convoluted tubule

completed in the collecting duct

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Verified step by step guidance

Understand the role of electrolytes in the body: Electrolytes are charged particles (ions) like sodium (Na+), potassium (K+), and chloride (Cl-) that are essential for maintaining fluid balance, nerve function, and muscle contraction.

Review the anatomy of the nephron: The nephron is the functional unit of the kidney, consisting of structures like the glomerulus, proximal convoluted tubule, distal convoluted tubule, and collecting duct. Each part has specific roles in filtration, reabsorption, and secretion.

Focus on the proximal convoluted tubule: This segment of the nephron is responsible for the majority of electrolyte reabsorption. Sodium ions (Na+) are actively reabsorbed here, and water follows by osmosis. Other electrolytes like potassium (K+) and chloride (Cl-) are also reabsorbed in this region.

Eliminate incorrect options: The distal convoluted tubule is involved in fine-tuning electrolyte balance, but it is not the primary site of reabsorption. The glomerulus is responsible for filtration, not reabsorption. The collecting duct primarily adjusts water reabsorption under hormonal control (e.g., ADH).

Conclude that the correct answer is: 'a function of the proximal convoluted tubule,' as this is the primary site where most electrolyte reabsorption occurs in the nephron.