A-Level Notes > York College A-Level Notes > Psychology Notes

Biological Rhythms Notes

This is a sample of our (approximately) 4 page long Biological Rhythms notes, which we sell as part of the Psychology Notes collection, a B package written at York College in 2015 that contains (approximately) 157 pages of notes across 48 different documents.

Learn more about our Psychology Notes

The original file is a 'Word (Docx)' whilst this sample is a 'PDF' representation of said file. This means that the formatting here may have errors. The original document you'll receive on purchase should have more polished formatting.

Biological Rhythms Revision

The following is a plain text extract of the PDF sample above, taken from our Psychology Notes. This text version has had its formatting removed so pay attention to its contents alone rather than its presentation. The version you download will have its original formatting intact and so will be much prettier to look at.

Biological rhythms

A cyclical variation over some period of time in physiological and psychological processes - frequencies of rhythms differ.

Types of rhythms:

Circadian - consistent cyclical variations that occur over 24 hours Ultradian - shorter than one day - more than one cycle every 24 hours Infradian - longer than one day - rhythms occur less than every 24 hours

Examples of circadian rhythms:

Sleep-wake cycle Heart rate, metabolic rate, breathing rate and body temperature all have maximum values in late afternoon and minimum values in early morning Hormone concentrations also vary in the body over the course of the day e.g. in women prolactin, a hormone that stimulates milk production, peaks at night Opening and closing of heliotropic plants Although circadian rhythms tend to be synchronised with cycles of light and dark, other factors e.g. ambient temperature, meal times, stress and exercise can influence timing as well

Examples of infradian rhythms:

Hibernation in squirrels Human menstrual cycle Migration of birds

Examples of ultradian rhythms:

Stages of sleep cycle

****************************End Of Sample*****************************

Buy the full version of these notes or essay plans and more in our Psychology Notes.