Which molecule is least likely to be able to travel via the macula communicans pathway

The right answer is Insulin, among the following A. Insulin  B. Cl-  C. Na+  D. Lysine

Explanation:

Insulin is a peptide hormone in the body and it is very large to travel via the macula pathway.  However, Amino acids, like lysine, are small molecules that will be able to travel through this pathway.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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