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 Step 2: Tubular Reabsorption

Anatomy & Physiology

25. The Urinary System

Renal Physiology Step 2: Tubular Reabsorption

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Multiple Choice

Where within the nephron does the majority of tubular reabsorption occur?

Distal convoluted tubule

Collecting duct

Loop of Henle

Proximal convoluted tubule

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Verified step by step guidance

Understand the function of the nephron: The nephron is the functional unit of the kidney, responsible for filtering blood and forming urine. It consists of several parts, each with specific roles in the process of urine formation.

Identify the role of the proximal convoluted tubule (PCT): The PCT is the first segment of the nephron tubule and is primarily responsible for the reabsorption of water, ions, and nutrients from the filtrate back into the bloodstream.

Compare the reabsorption capacity of different nephron segments: The PCT reabsorbs approximately 65-70% of the filtered water and sodium, along with a significant amount of glucose, amino acids, and other ions, making it the site of the majority of tubular reabsorption.

Consider the functions of other nephron segments: The distal convoluted tubule and collecting duct are involved in further reabsorption and secretion, but to a lesser extent compared to the PCT. The loop of Henle primarily concentrates urine by reabsorbing water and salts.

Conclude that the proximal convoluted tubule is the correct answer: Based on its role and capacity for reabsorption, the PCT is the segment where the majority of tubular reabsorption occurs within the nephron.