If your subject goes up to a high altitude for several weeks, which of the following are likely to occur?
Select all that apply (Answer is correct only if all correct answers are selected and no incorrect answers are selected)
a. the kidneys increase secretion of a hormone
b. an increase in hematocrit
c. secondary polycythemia
d. an increase in erythropoieten acting on bone marrow cells
e. a decrease in resistance to blood flow