Blame ‘Night of the Living Dead’ for this, but many people mistakenly think that zombies are nocturnal, going around their business of walking around town with stilted gaits, looking for people whose brains they can eat, only at night.
You think you are safe during the day? You are dangerously wrong!
Zombies are on the prowl at all times of day and night! They are not nocturnal, they are arrhythmic! And insomniac. They never sleep!
Remember how one becomes a zombie in the first place? Through death, or Intercision, or, since this is a science blog and we need to explain this scientifically, through the effects of tetrodotoxin. In any case, the process incurs some permanent brain damage.
One of the brain centers that is thus permanently damaged is the circadian clock. But importantly, it is not just not ticking any more, it is in a permanent “day” state. What does that mean practically?
When the clock is in its “day” phase, it is very difficult to fall asleep. Thus insomnia.
When the clock is in its “day” phase, metabolism is high (higher than at night), thus zombies require a lot of energy all the time and quickly burn through all of it. Thus constant hunger for high-calory foods, like brains.
Insomnia, in turn, affects some hormones, like ghrelin and leptin, which control appetite. If you have a sleepless night or chronic insomnia, you also tend to eat more at night.
But at night the digestive function is high. As zombies’ clock is in the day state, their digestion is not as efficient. They have huge appetite, they eat a lot, but they do not digest it well, and what they digest they immediately burn. Which explains why they tend not to get fat, while living humans with insomnia do.
Finally, they have problems with wounds, you may have noticed. Healing of wounds requires growth hormone. But growth hormone is secreted only during sleep (actually, during slow sleep phases) and is likewise affected by ghrelin.
In short, a lot of the zombies’ physiology and behavior can be traced back to their loss of circadian function and having their clock being in a permanent “day” state.
But the real take-home message of this is…. don’t let your guard down during the day!
Picture of me as a Zombie (as well as of all my Sciblings – go around the blogs today to see them) drawn by Joseph Hewitt of Ataraxia Theatre whose latest project, GearHead RPG, is a sci-fi rogue-like game with giant robots and a random story generator – check it out.
My HomepageMy homepage is at http://coturnix.org. It is temporarily stripped to minimal information, but more will come soon.
Search This Blog:
Bora Zivkovic on Morning at Triton Angie Lindsay Ma on Morning at Triton Linda chamblee on Morning at Triton Jekyll » Blog… on The Big Announcement, this tim… Mike H on The Big Announcement, this tim…
- Food goes through a rabbit twice. Think what that means!
- BIO101 - Protein Synthesis: Transcription and Translation
- Postscript to Pittendrigh's Pet Project - Phototaxis, Photoperiodism and Precise Projectile Parabolas of Pilobolus on Pasture Poop
- BIO101 - Cell Structure
- Welcome the Popular Science blog network
- Teaching Biology 101 (to adults)
- Biology and the Scientific Method
- Charlotte's Web: what was she smoking?
- Spring Forward, Fall Back - should you watch out tomorrow morning?
- A reexamination of the neurorealism effect: the role of context jcom.sissa.it/archive/15/06/… 1 day ago
- Communicating trust and trusting science communication ― some critical remarks jcom.sissa.it/archive/15/06/… 2 weeks ago
- Elections Matter: Why Pence Is A Scary Option For Women And Public Health forbes.com/sites/judyston… 2 weeks ago
- @MadSciKat rain and wind but not too bad here. Still have power. 2 weeks ago
- @jtaylorhodge neuroscience.stanford.edu/news/bimanual-… has good references 2 weeks ago
- RT @JsciCOM: Misunderstanding trust in science: a critique of the traditional discourse on science communication jcom.sissa.it/archive/15/05/… 1 month ago
- RT @JsciCOM: Trust in technologies? Science after de-professionalization jcom.sissa.it/archive/15/05/… 1 month ago
- RT @JsciCOM: Mediated trust in science: concept, measurement and perspectives for the `science of science communication' https://t.co/x4Wr4… 1 month ago
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.