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Substances cross the filtration barrier readily if smaller in size than:
A8 nm
B12 nm
C16 nm
D4 nm
Answer & Solution
Correct answer: D. 4 nm
1. Most substances up to eight nanometres pass freely.
2. Below a smaller threshold they cross readily.
3. That threshold is 4 nanometres.
_Source: OpenStax Anatomy and Physiology 2e, Chapter 25, The Urinary System._
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