explain the step by step procedure of how the circadian rhythm works in humans please?

Question

please help

Answer 1

This link should help:

http://en.wikipedia.org/wiki/Circadian_rhythm

Good luck.

Answer 2

The word circadian comes from the Latin circa diem meaning about a day, which starts out as a good definition for circadian rhythms. Circadian rhythms do not have to be daily and in fact can happen in multiple periods per day or periods that last longer than days such as circannual rhythms. The most thought of circadian rhythm is sleep but other examples include, body temperature, blood pressure, production of hormones and digestive secretions. These rhythms do not only take place in humans but are present in a wide variety of other organisms, the simplest being cyanobacteria. Circadian rhythms are usually controlled by a combination environmental factors and internal factors. The most common environmental factors are temperature and light.
Circadian rhythms are controlled by a circadian pacemaker, or a biological clock. This "clock" is the section of the brain known as the suprachiasmatic nucleus (SCN). The SCN is a pair of structures that contain about 20, 000 neurons and is located in the hypothalamus above where the optic nerves cross (1). This proximity to the optic nerve explains its reaction to light. Signals from light are received by the SCN taken in by the retina. Circadian rhythms include three different parts, a central oscillator, afferent pathways that carry environmental information to the oscillator, and efferent pathways that communicate the rhythm of the oscillator to the physiology and behavior of the organism (2).
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