Final answer:
Viscosity is the term used to describe the richness or thinness of a fluid. It refers to the resistance of a liquid to flow and can be measured using methods like the time it takes for a liquid to flow through a narrow tube. Viscosity affects blood pressure and flow, and is influenced by factors like the presence of plasma proteins and formed elements in blood.
Step-by-step explanation:
Viscosity is the term used to describe the richness or thinness of a fluid. It refers to the resistance of a liquid to flow. Liquids with low viscosity, such as water and gasoline, flow freely, while liquids with high viscosity, such as honey and motor oil, flow more slowly. Viscosity is influenced by factors like the presence of plasma proteins and formed elements in blood, and it affects blood pressure and flow. It can be measured using methods such as the time it takes for a liquid to flow through a narrow tube or the time it takes for steel balls to fall through a liquid.