If
you were are a 12 year old boy, like Ted, who loves watching the History
Channel, you would know all about the Holy Grail. Depending on your religion, you may know it as
a sacred cup linked to certain important Christian events; but there are also
Celtic myths about a cauldron with magical powers. Throughout history, people have been searching
for the Grail, from King Arthur to Indiana Jones.
This
blog is itself a search for the Holy Grail.
Monty
is a big fan of a well-known picture book series called Meg & Mog. It is about a nice witch called Meg and her
black cat called Mog. Featured
prominently is a magic cauldron, which Meg uses to cast her magic spells. Just click on the above link and all will
become clear.
So, we are looking
for the Grail
Well,
if you have struggled through all of this blog from the begining, you already
know where to start looking. California
looks pretty hot, but then again there are some rumours about somewhere in
France. All will be explained, as we
proceed further.
Homeostasis
First
we need to learn a new word, Homeostasis, if you
already know what it means, you are much brighter than me.
Do not confuse it with Homeopathy. There may be another coincidence here as well. Those generous people at Wikipedia give us
this definition:-
Homeopathy /ˌhoʊmiˈɒpəθi/ (also spelled homoeopathy or homœopathy; from the Greek hómoios-
ὅμοιος- "like-" + páthos
πάθος "suffering")
is a system of alternative
medicine originated in 1796 by Samuel Hahnemann, based on his doctrine of similia similibus curentur ("like cures like"), according to which a substance that causes
the symptoms of a disease in healthy people will cure similar symptoms in sick
people. Scientific research has found homeopathic
remedies ineffective and their postulated mechanisms of action implausible. The
scientific community regards homeopathy as a sham; the
American Medical Association considers homeopathy to be quackery,]and homeopathic
remedies have been criticized as unethical.
Now let’s get back to Homeostatis and to help us really
understand it, I decided to give a detailed example using the medical condition
diabetes.
Homeostatis is a process through which the body's
internal environment is kept stable. For
example, when the level of sugar in your blood is too high, your body detects
this, an alarm goes off and the body acts to reduce it; conversely when blood
sugar is too low, again the body detects this and sends a signal to raise
it. All this happens 24/7 and you do not
even need to think about it. That is, unless
you are diabetic.
So we have:-
·
A receptor,
like a tiny sensor that is constantly measuring blood sugar.
·
Positive feedback, when the receptor detects
a low level and then tells the body to raise the level of sugar
· Negative feedback is when another
receptor alarm goes off, and the body needs to lower the level of sugar in the
blood.
· Homeostatic imbalance occurs when the body is overwhelmed and can no longer
regulate itself and regain stability.
Many diseases are indeed the result of such an imbalance; diabetes is
but one.
Insulin is the principal hormone that regulates uptake of
glucose (sugar) from your blood. Insulin
is released into the blood after eating.
Insulin is also the principal control signal for conversion of glucose
to glycogen, for storage in your liver (and muscle cells).
Lowered glucose levels result both in the reduced release
of insulin and in the conversion of glycogen to glucose. This is mainly
controlled by the hormone glucagon, which acts in the opposite manner to
insulin. Glucose is forcibly produced from the liver (where it had been stored as
glycogen) and enters the bloodstream.
Both insulin and, its opposite, glucagon are produced in
the pancreas.
Summary
So we have a receptor constantly measuring your blood
sugar. You eat a chocolate bar, blood
sugar rises fast, an alarm goes off.
Release the insulin ! Insulin is
released from the pancreas. Remove
excess glucose and store it (as glycogen) in the liver ! Blood sugar level is falling. Homeostatis
restored; panic over.
Then you go for jog in the park. Receptor detects falling blood sugar. Release glucagon ! Glucagon is released from the pancreas. Go to the liver and tell it to start
converting glycogen back to glucose !
Blood sugar level is now rising.
Homeostatis restored, panic over.
Back to Ted and the quest for the grail
Ted sometimes finds it hard to explain what Dad’s job really
is; he is not the first to ponder this. Now, Ted has decided that his Dad can
officially be described as a wizard.
This helps me a great deal with this blog.
We
will now opt for the pagan Celtic myth about a cauldron with magical powers,
this will be our Holy Grail. We
just need a cauldron, a wizard, some ingredients and a magic spell. We are nearly there.
We even know part of the spell:- “ homeostatis and
channelopathy .........”
A final few words
In our first two weeks of this blog, we have been busy travelling. We started in France, went all the way to the
Punjab to meet a clever chap called Baldeep in Chandigarh.
Then we headed over to Palo Alto in California.
The
good news is that back at Monty's house, the cauldron is bubbling and the magic already seems to be working. We just lack a few more ingredients and that
elusive spell.