Brain diabetes, craving for sweets, and dementia patients' snack preferences
Doctors frequently seem to notice the intense craving for sweets in Alzheimer's Disease and other types of dementia patients.
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#1 Apr 3, 2012
cont:-Astrocytes can release gliotransmitters (like glutamate) by exocytosis to send signals to neighboring neurons.
Each astrocyte has its own territory (they don't overlap), and each may interact with several neurons and hundreds to thousands of synapses to properly integrate information.
"End-feet" connect to blood vessels in the brain. By signaling blood vessels to expand or narrow, astrocytes regulate local blood flow to provide oxygen and nutrients to neurons in need.
Astrocytes generate signals that are chemical rather than electrical. The details still need to be worked out, but astrocytes are somehow activated when the level of calcium ions increases inside the cell. This change in concentration signals the release (typically by exocytosis) of what are now called "gliotransmitters". These small molecules travel to a neighboring cell and deliver their message in a process very similar to that used by neurotransmitters.
Astrocytes are now thought to be involved in almost all aspects of brain function. Scientists want to know more about how gliotransmitters can inhibit, stimulate, or fine-tune the action potentials fired by neurons. But astrocytes may even do more.
There is growing evidence that astrocytes can alter how a neuron is built by directing where to make synapses or dendritic spines. They can also attract new cells to their territory (like immune cells and perhaps even adult neural stem cells) to repair any damage.
Knowing more about astrocytes will help with stem cell seeding and shed light on diseases in which communication between astrocytes and neurons is altered, including Alzheimer's disease, AIDS, brain cancer, and ALS (amyotrophic lateral sclerosis, also known as Lou Gehrig's disease).
The brain is not autonomous and is a transmitter of information combined and associate to every cell in the body and also fascinatingly can transmit information outside its normal sphere of influence' and also receive super information other than through normal senses' we think this is how Almighty God passes information to us' what some people call original thought or mystics call tellepathy or conscience:
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