Biological rhythms
- Created by: Molly
- Created on: 26-11-12 13:31
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- Biological Rythms
- biological rhythms are controlled by environmental factors such as light, temperature.
- called Zeitgebers
- endogenous pacemakers
- internal body clocks that regulate biological rhythms.
- SIFFRE (1975) stayed in cave for 6 months. in the absence of environmental zeitgebers such as light our endogenous pacemakers can still regulate
- two key brain structures in the control of biological rhythms are in the suprachiasmatic nucleus (SCN) and the pineal gland
- the SCN is a small group of neurons in the hypothalamus of the brain, has an inbuilt endogenous circadian rhythm
- STEPHAN AND ZUCKER (1972)- the rats- the scn is one of the key pacemakers in the brain controlling circadian rhythms.
- the SCN is a small group of neurons in the hypothalamus of the brain, has an inbuilt endogenous circadian rhythm
- internal body clocks that regulate biological rhythms.
- biological rhythms are controlled by environmental factors such as light, temperature.
- types
- circadian rythms: refers to 24 hour rhythms such as body temperature in humans and sleep wake cycle.
- include: sleep-wake cycle, body temperature, also brain neurotransmitters show circadian rhythms.
- nocturnal animals are active and alert at night, diurnal animals reverse the pattern.
- Biological Rythms
- biological rhythms are controlled by environmental factors such as light, temperature.
- called Zeitgebers
- endogenous pacemakers
- internal body clocks that regulate biological rhythms.
- SIFFRE (1975) stayed in cave for 6 months. in the absence of environmental zeitgebers such as light our endogenous pacemakers can still regulate
- two key brain structures in the control of biological rhythms are in the suprachiasmatic nucleus (SCN) and the pineal gland
- the SCN is a small group of neurons in the hypothalamus of the brain, has an inbuilt endogenous circadian rhythm
- STEPHAN AND ZUCKER (1972)- the rats- the scn is one of the key pacemakers in the brain controlling circadian rhythms.
- the SCN is a small group of neurons in the hypothalamus of the brain, has an inbuilt endogenous circadian rhythm
- internal body clocks that regulate biological rhythms.
- biological rhythms are controlled by environmental factors such as light, temperature.
- infradian rhythms: have a cycle length of more than one day. e.g menstrual cycle.
- e.g menstrual cycle and hibernation
- seasonal affective disorder (SAD) depression that effects vulnerable people in winter months.
- ultradian rhythm: these have more than one cycle in 24 hours.
- human sleep pattern: 5 stages of sleep , takes 90 mins
- circadian rythms: refers to 24 hour rhythms such as body temperature in humans and sleep wake cycle.
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