The red blood cells were placed into an isotonic solution. Water moved into and out of the cells to maintain homeostasis.
Answer: humoral immune response
The main antibody isotypes in the influenza-specific humoral immune response are IgA, IgM and IgG. Mucosal or secretory IgA antibodies are produced locally and transported along the mucus of the respiratory tract by transepithelial transport and can afford local protection from infection of airway epithelial cells.
I'm pretty sure it's Latin, acer means tree and I think rubrum is red
