Insulin-A protein hormone
produced in and liberated by the beta cells of the pancreas.
Stimulation of insulin production
Liberation of insulin from the pancreas
is stimulated by the consumption of
glucose and certain dietary proteins.
Physiological role of insulin
Once glucose is absorbed from the Gastrointestinal tract and passes into the blood, the
pancreas liberates insulin into the blood.
The higher the concentration of consumed sugar entering the blood, the
greater the amount of insulin that is liberated to help the body cope with now higher level
of blood sugar (also called blood glucose).
The newly liberated insulin then functions by facilitating the storage
and optimum usage of the blood glucose. Remember, glucose is a primary fuel of the brain and muscle,
and this is why it can be stored for later use,when needed.
Insulin promotes the
passage of glucose into the cells of the liver, and muscle. There it will remain until it
is needed. The glucose stored in muscle can be used for coversion to ATP, required for muscle contraction.
The glucose stored in the liver can be released back into the blood when the brain requires it.
When eating sugary foods, keep in mind that there is a limit to the amount of sugar that you can store
in the muscle and liver. Exceeding this level will simply cause the body to convert the excess sugars
into fat (adipose tissue) - which is another storage form of energy.