Final answer:
The correct statement is A, which indicates the high deformability of red cells compared to other cell types. It is important to understand the behavior of red blood cells in different solutions, such as when placed in pure water, they may undergo hemolysis. This highlights the influence of the formed elements and plasma proteins on blood viscosity.
Step-by-step explanation:
The correct statement among the options provided is A: The red cell is more readily deformable than other cell types. This characteristic of red blood cells (RBCs) allows them to easily navigate through the narrow capillaries of the circulatory system. When you place red blood cells in a hypotonic solution, such as pure water, water rushes into the cells due to the higher solute concentration inside them compared to the surrounding environment. This can lead to hemolysis, where RBCs swell and may burst because they cannot regulate their volume in such conditions. In contrast, the other options are inaccurate because blood viscosity is determined largely by the erythrocytes and plasma proteins, where blood has a viscosity approximately five times greater than water.