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42 questions
Which chains and bonds are crucial for the biological activity of insulin?
What is the role of C-peptide in insulin biosynthesis?
Which transporter facilitates glucose entry into pancreatic beta cells to stimulate insulin secretion?
How do incretins influence insulin secretion after a meal?
What is the molecular composition of the insulin receptor involved in signal transduction?
Which enzyme is activated by insulin to promote glycogen synthesis in liver and muscle?
How does insulin affect lipolysis in adipose tissue?
In the context of protein metabolism, what is a direct anabolic effect of insulin?
Which hormone is primarily responsible for stimulating hepatic gluconeogenesis and glycogenolysis, opposing insulin's effects?
What is the mechanism by which glucagon activates its cellular effects?
How does cortisol contribute to hyperglycemia?
What is the primary catabolic effect of cortisol on protein metabolism?
Insulin secretion is inhibited by alpha-2 adrenergic receptor agonists via the sympathetic nervous system.
GLUT4 transporter translocation to the cell membrane enhances glucose uptake in muscle and adipose tissue under insulin stimulation.
Insulin inhibits the enzyme glycogen phosphorylase, thereby preventing glycogen breakdown in liver and muscle.
Growth hormone stimulates insulin-mediated glucose uptake in peripheral tissues leading to hypoglycemia.
Adrenaline increases cAMP in hepatocytes, activating glycogenolysis and inhibiting glycogen synthesis.
Somatostatin enhances insulin secretion by acting on pancreatic delta cells.
The pentose phosphate pathway activation by insulin provides NADPH necessary for fatty acid synthesis.
Glucagon secretion is inhibited by low plasma glucose concentrations.
Insulin promotes cellular uptake of potassium, which helps prevent hyperkalemia.
Pré-pro-insulin is the active form of insulin secreted by beta cells.
Glucagon stimulates lipolysis in adipose tissue, increasing free fatty acid availability.
Parasympathetic nervous system activation inhibits insulin secretion during the cephalic phase.
Explain how glucose metabolism in pancreatic beta cells triggers insulin secretion.
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Describe the storage form of insulin within pancreatic beta cells and its structural components.
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Outline the main enzymatic changes insulin induces to inhibit hepatic gluconeogenesis.
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How does the parasympathetic nervous system contribute to insulin secretion during the cephalic phase?
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Describe cortisol’s dual role in glucose and protein metabolism contributing to hyperglycemia.
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Explain the mechanism by which adrenaline increases blood glucose during acute stress.
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What are the metabolic consequences of insulin deficiency on protein metabolism?
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How does insulin promote lipid storage through its action on lipoprotein lipase and fatty acid synthesis?
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What is the significance of biphasic insulin secretion in response to glucose stimuli?
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Identify the main cells of the pancreatic islets responsible for producing insulin and glucagon, including their approximate relative proportions.
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Explain how somatostatin modulates the endocrine pancreas function.
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Describe the catabolic and anabolic actions of growth hormone on metabolism relevant to glycemia.
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What is the effect of incretins on alpha cells of the pancreas during a meal?
Which gas protein is activated by glucagon receptors to increase cAMP levels in target cells?
Insulin stimulates the breakdown of triglycerides in adipose tissue by activating hormone-sensitive lipase.
The presence of high plasma glucose levels stimulates glucagon secretion from alpha cells.
What metabolic pathways does glucagon promote in liver cells?
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Describe how cortisol influences protein metabolism during stress conditions.
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