Bio Rhythms Key terms.

Circadian rhythm - A regular pattern with a 24 hour cycle, eg. Body Temperature.

Ultradian Rhythm - A cycle of less than 24 hours, eg. The Sleep cycle.

Infradian Rhythm - A cycle longer than 24 hours, eg. Menstrual cycle.

Endogenous Pacemaker - Internal Body clock.

Exogenous Zeitgeber - Environmental factor which acts as a time cue, eg. light

REM - Rapid eye movement, deep sleep.

NREM - Non-rapid eye…