Excessive Sweating & Rate of Oxygen Delivery

[blazinfury]

One cause of reduced state of oxygen delivery to internal tissues during excessive sweating is

a. increased blood viscosity

b. increased blood pH

c. decreased blood viscosity

d. decreased blood pH

 

The answer was A. Now I understand that during extreme sweating one would experience decreased blood volume. As such, the blood osmol would increase because you have a higher concentration of particles in a smaller volume. However, won't blood travel slower and as such there would be a chance of greater exchange of O2 for CO2 or is the concentration of O2 less in the blood as well?