There are 5 stages of sleep. The first four are under NREM and the last stage is REM. At stage 4 of NREM, the person can have deep sleep and brains continuously producing delta waves. If the person was aroused at this stage the person will feel disoriented upon waking up. This is the last stage of NREM. This will be followed by the REM or the stage where there is rapid eye movement even when the eyes is still closed,
Humoral immunity protects the body against extracellular pathogens and their toxins. Cell-mediated immunity protects the body against intracellular pathogens. Recognises pathogens in circulating in blood or lymph.
celluler immunity is very specific compared with humoral