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Insulin and Diabetes
N/A
48
Physiology
Undergraduate 1
03/28/2015

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Cards

Term
Insulin is released from what?
Definition
pancreatic beta cells (Islets of Langerhans).
Term
Insulin acts via what?
Definition
cell surface receptors.
Term
Insulin increases...
Definition
glucose entry into cells with GLUT4 transporter.
Term
Tissue(s) that use GLUT4 transporters include...
Definition
fat cells and muscle.
Term
Some cells are insulin insensitive, meaning what?
Definition
don't need insulin to turn on.
Term
Tissue(s) that are insulin insensitive include:
Definition
brain, kidney and intestines.
Term
Insulin increases...
Definition
protein synthesis.
Term
Insulin stimulates what?
Definition
glycogenesis and glycolysis.
Term
Insulin inhibits what?
Definition
glycogenolysis and gluconeogenesis.
Term
What is glycogenesis?
Definition
glycogen synthesis in the liver and muscle; promotes glucose transport into cells.
Term
What is glycolysis?
Definition
glucose breakdown and fat synthesis.
Term
What is glycogenolysis?
Definition
glycogen breakdown.
Term
What is gluconeogenesis?
Definition
new glucose formation.
Term
Stimuli for insulin release include:
Definition
elevated blood glucose and parasympathetic stimulation.
Term
Insulin release is inhibited by what?
Definition
sympathetic stimulation.
Term
What is the normal (fasting) level of blood glucose?
Definition
5 mM (90 mg/dL).
Term
Insulin release is potentiated by what?
Definition
GIP (glucose-dependent insulinotropic peptide) from intestines.
Term
Glucagon is synthesized where?
Definition
pancreatic alpha cells.
Term
What is glucagon's effect on plasma glucose levels?
Definition
increases.
Term
What is the primary target og glucagon?
Definition
liver.
Term
Glucagon promotes what?
Definition
glycogenolysis and gluconeogenesis.
Term
Glucagon is suppressed by what?
Definition
increased plasma glucose levels and insulin.
Term
What is glucose tolerance?
Definition
ability to dispose of glucose (absorb).
Term
In diabetes, fasting plasma glucose may be...
Definition
normal.
Term
In a normal glucose tolerance test, the body can dispose of an oral glucose load with...
Definition
only a small rise in plasma glucose.
Term
Type I diabetes mellitus (juvinile onset) is...
Definition
insulin dependent.
Term
Type II diabetes mellitus (mature onset) is...
Definition
non-insulin dependent.
Term
Type I diabetes accounts for about...
Definition
10% of cases.
Term
Type I diabetes is caused by what?
Definition
autoimmune attack on beta cells.
Term
Type I diabetes onset often occurs at a young age and requires...
Definition
insulin injections.
Term
What is insulin shock?
Definition
excess insulin caused by hypoglycemia.
Term
A lack of fuel (glucose) for the brain results in what?
Definition
coma.
Term
Hypoglycemia normally triggers secretion of what?
Definition
glucagon, epinephrine, cortisol and growth hormone.
Term
What does exercise do in diabetes?
Definition
moves glucose into muscle without insulin.
Term
Type II diabetes accounts for...
Definition
90% of cases.
Term
Type II diabetes ia often associated with what?
Definition
obesity.
Term
In Type II diabetes, insulin levels are often...
Definition
normal or high.
Term
Resistance to insulin action means...
Definition
decreased receptor sensitivity, post-receptor malfunction, antibody to insulin (rare).
Term
Control for Type II diabetes includes:
Definition
diet, exercise, oral hypoglycemics, and injected insulin (not often).
Term
Oral hypoglycemics...
Definition
stimulate insulin release or boost insulin action.
Term
Uncontrolled diabetes results in...
Definition
hyperglycemia.
Term
Glucosuria produces:
Definition
polyuria, hyperosmolarity and polydipsia.
Term
Hyperglycemia promotes...
Definition
fat breakdown.
Term
Fat breakdown causes the production of what?
Definition
ketone bodies.
Term
The main ketone bodies produced are what?
Definition
acetoacetic acid and beta-hydroxybutyric acid.
Term
Ketone bodies contribute to what?
Definition
metabolic acidosis.
Term
The respiratory compensation for metabolic acidosis is what?
Definition
hyperventilation.
Term
Hyperosmolarity, acidosis and dehydration can eventually result in what?
Definition
coma and death.
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