Circadian Rhythms Flashcards
Many biorhythms exhibited in humans appear to be linked to _
Environmental rhythms
Biorhythms that occur in 24-hour cycle correspond to _ or _ are called circadian rhythms
Solar cycle
Light-dark cycle
Circadian literally means _
About a day
Body temp fluctuates over 24 hour period and is lowest at
Middle of night
(Sleep-wake cycle)
Body temp reaches peek at _
Mid-afternoon
(Sleep-wake cycle)
Level of many hormones correspond with _ cycle
Sleep-wake
Production of _ is a circadian rhythm hormone
Cortisol
Cortisol production rises when we _
Wake
Cortisol production peaks at _ AM
9
Cortisol production lowest at _
Midnight
Production of _ also follows circadian rhythm
Thyroid stimulating hormones from pituitary
Thyroid hormones act directly in almost all _
Body cells
Thyroid hormones act directly in almost all body cells, controlling their rate of _
Metabolism
Levels of thyroid hormone reach peak at _
11 pm
Levels of thyroid hormones are lowest at _
11 am
Productions of other hormones like _ and _ also vary in a circadian rhythm
Endorphins
Sex hormones
