Topics:
Animal Physiology, Animal Refresher
Decreasing Order of Fluid Compartment Volumes
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Question (English)
Arrange the different fluid compartments in decreasing order of their volume:
- ICF > ECF > ISF > PV > TCF ✓ Correct
- ECF > ICF > ISF > PV > TCF
- ECF > ICF > PV > ISF > TCF
- ICF > ECF > ISF > TCF > PV
Explanation:
Correct Answer: ICF > ECF > ISF > PV > TCF
The body fluids are distributed in compartments with the following volumes (as % of body weight):
Fluid Compartment Volumes
| Compartment | Abbreviation | % Body Weight |
|---|---|---|
| Total Body Water | TBW | 60–70% |
| Intracellular fluid | ICF | 40% (largest) |
| Extracellular fluid | ECF | 20% |
| Interstitial fluid | ISF | 15% |
| Plasma volume | PV | 5% |
| Transcellular fluid | TCF | Smallest (body cavities: CSF, synovial, intraocular, etc.) |
Note: ECF = ISF + PV + TCF (20% total). ICF cannot be measured directly; it is calculated as TBW − ECF.
Why Other Options Are Wrong
- ECF > ICF → Wrong; ICF (40%) is always larger than ECF (20%).
- PV before ISF → Wrong; ISF (15%) is always larger than PV (5%).
- TCF before PV → Wrong; TCF is the smallest compartment, always less than PV.
📚 About this Topic — Animal Physiology
This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.
