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

Tubular reabsorption of Na+ from the proximal tubule involves which of the following mechanisms?

Active transport via Na+/K+ ATPase pumps

Facilitated diffusion through aquaporins

Simple diffusion across the tubular membrane

Endocytosis into tubular cells

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Verified step by step guidance

Understand that tubular reabsorption is the process by which the nephron removes water and solutes from the tubular fluid and returns them to the circulating blood.

Recognize that sodium (Na+) reabsorption in the proximal tubule is a crucial step in maintaining electrolyte balance and blood pressure.

Identify that active transport is a process that requires energy, typically in the form of ATP, to move substances against their concentration gradient.

Learn that the Na+/K+ ATPase pump is a type of active transport mechanism that moves Na+ out of the tubular cells into the interstitial fluid, while bringing K+ into the cells, using energy from ATP.

Differentiate between active transport and other mechanisms such as facilitated diffusion, which involves transport proteins but does not require energy, and simple diffusion, which is the passive movement of molecules down their concentration gradient.