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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

2. Cell Chemistry & Cell Components

Osmosis

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Osmosis

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Multiple Choice

What is the osmolarity of the filtrate at the end of the proximal tubule?

600 mOsm/L

1200 mOsm/L

100 mOsm/L

300 mOsm/L

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Verified step by step guidance

Understand that osmolarity refers to the concentration of solute particles in a solution, measured in milliosmoles per liter (mOsm/L).

Recognize that the proximal tubule is part of the nephron in the kidney, where reabsorption of water, ions, and nutrients occurs.

Recall that in the proximal tubule, approximately 65% of the filtrate is reabsorbed, including water and solutes, which helps maintain the osmolarity of the filtrate.

Note that the osmolarity of the filtrate at the end of the proximal tubule is typically isosmotic with blood plasma, which is around 300 mOsm/L.

Conclude that despite the reabsorption processes, the osmolarity remains relatively constant at the end of the proximal tubule due to the proportional reabsorption of solutes and water.