Question

the viscosity of blood is due more to the presence of ______ than to any other factor.

Explanation:

In the context of blood viscosity, the main factor contributing to it is the presence of red blood cells (erythrocytes). Blood viscosity is influenced by various components, but red blood cells, due to their number and properties, have a significant impact. Plasma proteins also play a role, but red blood cells are the primary factor for the viscosity of whole blood.

Answer:

red blood cells (erythrocytes)