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

By which process is water primarily reabsorbed into the bloodstream during tubular reabsorption in the kidneys?

Endocytosis

Osmosis

Active transport

Facilitated diffusion

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Verified step by step guidance

Understand the concept of tubular reabsorption: Tubular reabsorption is a process in the kidneys where substances are moved from the renal tubules back into the bloodstream. This is crucial for maintaining the body's fluid and electrolyte balance.

Identify the primary mechanism for water reabsorption: Water is primarily reabsorbed through osmosis, which is the movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Differentiate osmosis from other processes: Osmosis is a passive process, meaning it does not require energy. In contrast, active transport requires energy to move substances against their concentration gradient, and facilitated diffusion involves the use of transport proteins but still does not require energy.

Consider the role of the nephron: Within the nephron, particularly in the proximal convoluted tubule, water reabsorption occurs as solutes are reabsorbed, creating a concentration gradient that drives osmosis.

Review the importance of osmosis in kidney function: Osmosis is vital for concentrating urine and conserving water, allowing the kidneys to regulate the body's hydration status effectively.