Biological rhythms are cyclical patterns within biological systems that have evolved in response to environmental influences.
The two key factors that govern biological rhythms
endogenous pacemakers, the body's biological clocks, and exogenous zeitgebers, which changes in the environment
An example of circadian rhythms
The sleep-wake cycle, which dictates when humans should be asleep and awake
What does light do
light acts as an external cue that tells our body to wake or sleep. Light is first detected by the eye, which then sends messages to the super charismatic nuclei. The SCN then uses this information to coordinate the activity of the entire circadian system
