FIG. 1 is a front, left side prspective view of a reaction unit for use in analyzing biological fluids, showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a front, left side perspective view of a second embodiment of the reaction unit for use in analyzing biological fluids;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a bottom plan view thereof; and

FIG. 8 is a right side elevational view thereof.