biological rhythms

Question 1

lnfradian Rhythms

Answer 1

Biological rhythm with a frequency of less than one cycle in 24hours such as menstrual cycle and SAD

Question 2

Ultradian Rhythm

Answer 2

More than one cycle in 24hours such as the stages of sleep

Question 3

Circadian rhythms

Answer 3

Happen over a time period of about 24 hours
such as the sleep-wake cycle

Question 4

How are biological rhythms controlled ?

Answer 4

Control of rhythms is determined by external or internal factors

Question 5

Endogenous pacemakers
sleep example

Answer 5

Referred to as internal biological clocks that control natural rhythms
The sleep endogenous pacemaker-
SCN (Suprachiasmatic nucleus) which is part of the hypothalamus signals the pineal gland to produce the hormone melatonin which causes sleep.