Circadian Rhythm Flashcards Preview

Physiology 2130 > Circadian Rhythm > Flashcards

Flashcards in Circadian Rhythm Deck (7):
1

What are the circadian rhythms?

The natural patterns of physiological and behavioural processes that are timed to a near 24h period

2

What are the circadian rhythms responsible for?

Responsible for releasing melatonin

3

Where are the circadian rhythms located?

The biological clock of the hypothalamus
-suprachiasmatic nucleus

4

Where does melatonin come from and what does it do?

Released from pineal gland

Highly influenced by natural dark/light cycles (inhibited by light) through SNS activation. Light activates limbic core through neurons, and comes back neurally to activate the pineal gland
-indirect control of melatonin release

5

Where is the pineal gland?

Deep within the brain. but not actually apart of it (like the anterior pituitary)
-release of melatonin is control day the SNS

6

What is able to trick the melatonin system?

LED light can trick this system b y suppressing melatonin levels.
Viewing LED screens after dark can result in a decreased ability to fall asleep

7

What are the 9 processes that the biological clock (suprachiasmiatic nucleus) controls?

1. Sleep
2. Food and water intake
3. Urine production
4. Blood Pressure
5. Platelette aggregation
6. White Blood Cell Production
7. Body Temperature Changes
8. Hormone Release
9. Menstrual Cycle