The rate at which blood flows through the human body changes in response to many factors. which statement describes one of these factors and its effect on blood flow?
a. a high viscosity of blood causes an increased resistance in the blood vessels and leads to slow blood flow.
b. a low blood ph decreases the rate of diffusion through the blood vessels and leads to slow blood flow.
c. the changing of the shape of red blood cells to a crescent shape decreases resistance and lead to a faster blood flow.
d. the narrowing of blood vessels increases pressure and leads to a faster blood flow.