Which gland or organ secretes epinephrine and aldosterone? 

The first and perhaps the single most important step in phlebotomy, and often where an error occurs, is:

a. cleansing the site b. patient identification c. using a clean needle d. using the proper evacuated tube

A device for spinning a specimen at high speed until it separates into its component parts is a ____. 

A. centrifuge B. glucometer C. photometer D. volumetric beaker E. hemocytometer