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 process in the nephron is least selective?

Tubular secretion

Glomerular filtration

Tubular reabsorption

Countercurrent multiplication

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Verified step by step guidance

Begin by understanding the function of the nephron, which is the functional unit of the kidney responsible for filtering blood and forming urine.

Identify the key processes occurring in the nephron: glomerular filtration, tubular reabsorption, tubular secretion, and countercurrent multiplication.

Glomerular filtration is the process where blood plasma is filtered through the glomerulus into the Bowman's capsule. This process is driven by blood pressure and is non-selective, meaning it filters out both waste products and useful substances indiscriminately.

Tubular reabsorption involves the selective uptake of water, ions, and nutrients from the filtrate back into the blood, ensuring essential substances are retained.

Tubular secretion is the selective process of adding substances from the blood into the tubular fluid, helping to eliminate waste and regulate blood pH. Countercurrent multiplication is a mechanism that concentrates urine in the loop of Henle, involving selective reabsorption of water and ions.