Hi,
My
name is Franz Devantier, creator of this blog. I
am an Herbalist, who uses local and indigenous herbs when available, in
preference to imported herbs. Because
Herbalists deal with living human beings, it is important to have an
understanding of Anatomy and Physiology, as well as many other related
subjects.
Positive
Feedback Mechanisms
Positive feedback works a little bit differently. The result or response of the mechanism
enhances or exaggerates the original stimulus, so that the activity or the
output is accelerated. This type of
feedback mechanism is called Positive Feedback.
With positive feedback the change that occurs, continues to proceed in
the same direction as the original disturbance, causing the variable to deviate
further and further from its original value or set point. Negative feedback mechanisms keep
physiological functions for example blood chemicals within narrow ranges. Positive feedback mechanisms control episodic
or infrequent events that do not need to be continuously adjusted. Positive feedback mechanisms set off a series
of events that may be self-perpetuating and quite explosive.
Positive feedback mechanisms can easily race out of
control, they are rarely used to control the moment to moment well being of the
body, or to maintain normal homeostasis.
Positive Feedback mechanisms are also referred to as cascades, cascade
in Italian means to fall.
There are only a few examples of Positive feedback
mechanisms in the Human Body. Two
examples are blood clotting, and the enhancement of labor contractions during
birth.
Blood clotting is a normal response to laceration or damage
to the lining of a blood vessel. This
mechanism is an important mechanism in restoring Homeostasis, through the
process of the positive feedback.
1.) Break or tear in blood vessel wall.
2.) Clotting occurs as platelets adhere to the site and
release chemicals
3.) Released chemicals attract more platelets. (Positive feedback mechanism)
4.) Clotting
proceeds until break is sealed by newly formed clot.
Finally once the clot is formed the positive feedback
mechanism shots off, and the body is back to a state of Homeostasis.
The positive feedback mechanism that intensifies labor
contractions during birth of the baby works like this:
As the baby moves down into the mothers birth canal, the
increased pressure on the mothers cervix, which is the muscular outlet of the
uterus; excites receptors that are located in the cervix. These receptors send rapid nerve impulses
to the brain, the brain responds by triggering the release of the hormone
oxytocin. Oxytocin is transported in the
blood to the uterus where it stimulates the muscles in the uterine wall to
contract even more vigorously. This
forces the baby still further into the birth canal. This cyclic series of events continues,
causing the uterine contractions to become more frequent and more powerful,
until the baby is finally born. Once the
baby is born the stimulus for oxytocin
release ends. Remember the stimulus was
the pressure of the baby pressing against the cervix. So when the baby is no longer pressing
against the cervix, the positive feedback mechanism shuts off. The body moves back into a state of homeostasis.
Franz Devantier,
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