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 does most selective reabsorption take place in the nephron?

Loop of Henle

Proximal convoluted tubule

Distal convoluted tubule

Collecting duct

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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 process of selective reabsorption: Selective reabsorption is the process by which the nephron reabsorbs essential substances from the filtrate back into the blood, while waste products remain in the filtrate to be excreted as urine.

Examine the role of the proximal convoluted tubule (PCT): The PCT is the first segment of the nephron tubule after the glomerulus. It is responsible for reabsorbing approximately 65-70% of the filtered water, sodium, and other solutes, making it the primary site for selective reabsorption.

Compare with other nephron segments: The Loop of Henle, distal convoluted tubule, and collecting duct also participate in reabsorption, but to a lesser extent. The Loop of Henle primarily concentrates urine, while the distal convoluted tubule and collecting duct fine-tune the reabsorption of water and electrolytes.

Conclude that the proximal convoluted tubule is the main site for selective reabsorption: Given its role and the volume of substances reabsorbed, the PCT is the most significant site for selective reabsorption in the nephron.