The solute concentration in blood is equivalent to 0.9% NaCl. In a lab, students viewed a sample of blood with a microscope. Next, several drops of blood were added to three different solutions: 0.09% NaCl,
0.9% NaCl, and
9% NaCl.

1. In the figure below, the panel on the left shows how the RBCs appeared in the blood when viewed at 400× magnification. Label the three other panels by indicating which shows RBCs added to 0.09% NaCl, to 0.9% NaCl, and to 9% NaCl. Below the panels, indicate whether each solution is isotonic, hypertonic, or hypotonic in relation to RBCs.