D515 EN Lecture 4: Endocrine Pharmacology 1 with
complete solutions.
What is the endocrine function of the pancreas?
The endocrine function is carried out by the islets of Langerhans, which
produce insulin (from beta cells) and glucagon (from alpha cells). These hormones are crucial
for regulating blood glucose levels.
How is insulin produced and stored in the pancreas?
Insulin is derived from proinsulin, composed of an A and B chain joined by a C peptide. When
the C peptide is removed, insulin is formed and stored in the beta cells until it is needed.
How does insulin facilitate glucose uptake?
Glucose in the pancreas stimulates K+ and Ca2+ channels, causing insulin release.
Free insulin binds to insulin receptors (tyrosine kinase receptors), enabling glucose
transporters to increase glucose uptake by cells, promoting
glycolysis and signaling the liver to stop glucose production.
What other roles does insulin have besides glucose regulation?
Insulin acts as an insulin-like growth factor, contributing to the regulation of cell growth and
proliferation.
What stimulates the release of glucagon from the pancreas?
A drop in blood glucose levels due to natural cycles, prolonged fasting, exercise, or high-
protein meals triggers glucagon release from alpha cells in the islets of Langerhans.
,How does glucagon affect the liver?
Glucagon prompts the liver to break down glycogen into glucose and produce new
glucose from non-carbohydrate sources, such as amino acids. It also converts fats into
ketones for energy and signals the liver to stop storing glucose as glycogen.
How do glucagon and insulin regulate blood glucose levels?
Glucagon prevents hypoglycemia by raising blood glucose levels, while insulin prevents
hyperglycemia by lowering blood glucose levels, maintaining balance.
symptoms of hypoglycemia
tachycardia, sweating, shaking, anxiety, dizziness, confusion, hunger
symptoms of hyperglycemia
increased thirst, frequent urination, blurred vision, fatigue, extreme hunger
What causes Type I Diabetes Mellitus (T1DM)?
T1DM is caused by autoimmune destruction of the pancreatic islets of
Langerhans (Beta cells), leading to a severe deficiency of insulin. It is influenced by genetic
predisposition and unclear environmental factors.
Who is typically affected by Type I Diabetes, and what are other names for it?
-accounts for 5-10% of all diabetics and is commonly diagnosed in children and adolescents.
-It is also known as insulin-dependent diabetes, Brittle diabetes, or juvenile-onset diabetes.
What are common symptoms of Type I Diabetes Mellitus?
, -Hyperglycemia including unusual thirst, frequent urination, extreme hunger with weight loss,
blurred vision, fatigue, and weakness.
-Complications may involve diabetic retinopathy, neuropathy, and nephropathy.
Patient Case: What could explain fruity-smelling breath, extreme thirst, and fatigue in a 6-
year-old patient with no medical history?
The patient may be experiencing diabetic ketoacidosis (DKA), indicated by fruity breath,
extreme thirst, and fatigue. The next step is to seek assistance and check the patient’s blood
glucose level to confirm.
What is diabetic ketoacidosis?
-life-threatening problem caused by lack of insulin, which causes liver to break down too
much fat
-ketones, a byproduct of fat breakdown, accumulate in the blood and make the blood acidic
-sx: nausea, vomiting, stomach pain, dehydration, decreased alertness, rapid breathing,
and fruity-smelling aroma
-often one of first signs of Type 1 Diabetes
What happens to insulin and C-peptide levels in Type I Diabetes?
Both insulin and C-peptide levels (byproduct created when insulin is produced) are
greatly decreased due to the autoimmune destruction of beta cells.
What role do antibody levels play in diagnosing Type I Diabetes?
The presence of islet cell autoantibodies confirms the autoimmune nature of Type I Diabetes.
complete solutions.
What is the endocrine function of the pancreas?
The endocrine function is carried out by the islets of Langerhans, which
produce insulin (from beta cells) and glucagon (from alpha cells). These hormones are crucial
for regulating blood glucose levels.
How is insulin produced and stored in the pancreas?
Insulin is derived from proinsulin, composed of an A and B chain joined by a C peptide. When
the C peptide is removed, insulin is formed and stored in the beta cells until it is needed.
How does insulin facilitate glucose uptake?
Glucose in the pancreas stimulates K+ and Ca2+ channels, causing insulin release.
Free insulin binds to insulin receptors (tyrosine kinase receptors), enabling glucose
transporters to increase glucose uptake by cells, promoting
glycolysis and signaling the liver to stop glucose production.
What other roles does insulin have besides glucose regulation?
Insulin acts as an insulin-like growth factor, contributing to the regulation of cell growth and
proliferation.
What stimulates the release of glucagon from the pancreas?
A drop in blood glucose levels due to natural cycles, prolonged fasting, exercise, or high-
protein meals triggers glucagon release from alpha cells in the islets of Langerhans.
,How does glucagon affect the liver?
Glucagon prompts the liver to break down glycogen into glucose and produce new
glucose from non-carbohydrate sources, such as amino acids. It also converts fats into
ketones for energy and signals the liver to stop storing glucose as glycogen.
How do glucagon and insulin regulate blood glucose levels?
Glucagon prevents hypoglycemia by raising blood glucose levels, while insulin prevents
hyperglycemia by lowering blood glucose levels, maintaining balance.
symptoms of hypoglycemia
tachycardia, sweating, shaking, anxiety, dizziness, confusion, hunger
symptoms of hyperglycemia
increased thirst, frequent urination, blurred vision, fatigue, extreme hunger
What causes Type I Diabetes Mellitus (T1DM)?
T1DM is caused by autoimmune destruction of the pancreatic islets of
Langerhans (Beta cells), leading to a severe deficiency of insulin. It is influenced by genetic
predisposition and unclear environmental factors.
Who is typically affected by Type I Diabetes, and what are other names for it?
-accounts for 5-10% of all diabetics and is commonly diagnosed in children and adolescents.
-It is also known as insulin-dependent diabetes, Brittle diabetes, or juvenile-onset diabetes.
What are common symptoms of Type I Diabetes Mellitus?
, -Hyperglycemia including unusual thirst, frequent urination, extreme hunger with weight loss,
blurred vision, fatigue, and weakness.
-Complications may involve diabetic retinopathy, neuropathy, and nephropathy.
Patient Case: What could explain fruity-smelling breath, extreme thirst, and fatigue in a 6-
year-old patient with no medical history?
The patient may be experiencing diabetic ketoacidosis (DKA), indicated by fruity breath,
extreme thirst, and fatigue. The next step is to seek assistance and check the patient’s blood
glucose level to confirm.
What is diabetic ketoacidosis?
-life-threatening problem caused by lack of insulin, which causes liver to break down too
much fat
-ketones, a byproduct of fat breakdown, accumulate in the blood and make the blood acidic
-sx: nausea, vomiting, stomach pain, dehydration, decreased alertness, rapid breathing,
and fruity-smelling aroma
-often one of first signs of Type 1 Diabetes
What happens to insulin and C-peptide levels in Type I Diabetes?
Both insulin and C-peptide levels (byproduct created when insulin is produced) are
greatly decreased due to the autoimmune destruction of beta cells.
What role do antibody levels play in diagnosing Type I Diabetes?
The presence of islet cell autoantibodies confirms the autoimmune nature of Type I Diabetes.
