The major constituent of blood plasma is:
A. protein
B. $\mathrm{NaCl}$
C. water
D. cholesterol
Choose A, B, C or D as your solution.
The correct answer is C. Blood is a fluid made up of liquid plasma (55\%), the primary component of which is water, and floating cells (45\%). The plasma is richly endowed with dissolved proteins, lipids, and carbohydrates.