by enabling the storage of glucose in the form of glycogen in the
liver (Guyton and Hall 1996). Brain tissue, however,
does not rely on insulin to absorb glucose, as it is
already fully permeable to it and cannot use other
sources of energy. This explains why low serum blood
glucose is so dangerous. Having a half-life of approximately
six minutes, insulin can be totally cleared from
the body within 10-15 minutes and its production is
controlled via a negative feedback system. If serum
glucose levels drop, so does the insulin secretion,
while glucagon manufacture intensifies. In an
absence of insulin, large quantities of fatty acids are
released into the circulation following the breakdown
of stored triglycerides. This raises the volume of fatty
acids in the liver cells, which are then converted into
aceto-acetic acid. This cannot be metabolised by
peripheral tissues and culminates in a state of
acidosis (Bowen 1999), frequently seen in severe
hyperglycaemia. This can result in hyperventilation as
carbon dioxide is blown off. If bicarbonate production
is reduced, as in pancreatitis, then blood pH can drop to below 7.0, causing death (Steinberg and
Tenner 1994).
by enabling the storage of glucose in the form of glycogen in the
liver (Guyton and Hall 1996). Brain tissue, however,
does not rely on insulin to absorb glucose, as it is
already fully permeable to it and cannot use other
sources of energy. This explains why low serum blood
glucose is so dangerous. Having a half-life of approximately
six minutes, insulin can be totally cleared from
the body within 10-15 minutes and its production is
controlled via a negative feedback system. If serum
glucose levels drop, so does the insulin secretion,
while glucagon manufacture intensifies. In an
absence of insulin, large quantities of fatty acids are
released into the circulation following the breakdown
of stored triglycerides. This raises the volume of fatty
acids in the liver cells, which are then converted into
aceto-acetic acid. This cannot be metabolised by
peripheral tissues and culminates in a state of
acidosis (Bowen 1999), frequently seen in severe
hyperglycaemia. This can result in hyperventilation as
carbon dioxide is blown off. If bicarbonate production
is reduced, as in pancreatitis, then blood pH can drop to below 7.0, causing death (Steinberg and
Tenner 1994).
การแปล กรุณารอสักครู่..
