Which of the following is the most appropriate test to differentiate hemoglobin S trait from hemoglobin S disease?

There is no need for a condenser because the light strikes the object from above in the ____________________ microscope.

Fill in the blank(s) with the appropriate word(s).

Carbon dioxide acts as a vasodilator in ____ blood vessels.

A. hepatic B. renal C. gastrointestinal D. cerebral