NSG 530 Exam 4 Study Guide
Modules 9, 10 & 11
Endocrine Function
Anatomy and Physiology
Endocrine System
● Complex Messaging and Control System:
o Uses hormones secreted by glands located throughout the body.
o Hormones are classified or described in regard to action, source, or
chemical structure.
Key Glands of the Endocrine System
1. Pituitary Gland:
o Often referred to as the "master gland" because it controls other
endocrine glands.
o Produces hormones such as growth hormone (GH), prolactin, and
adrenocorticotropic hormone (ACTH).
1. (Growth hormone) GH
2. Prolactin
3. ACTH 2. Hypothalamus:
o Located in the brain. o Regulates the pituitary gland through
releasing and inhibiting hormones.
3. Pancreas:
o Functions both as an endocrine and exocrine gland. o Endocrine
Function: Secretes insulin and glucagon to regulate blood sugar levels.
4. Thyroid Gland:
, o Located in the neck. o Produces hormones such as thyroxine (T4)
and triiodothyronine (T3), which regulate metabolism.
1. Thyroxine 2.
Triiodothyronine 5. Parathyroid
Glands:
o Small glands located on the posterior surface of the thyroid gland.
o Produce parathyroid hormone (PTH), which regulates calcium levels
in the blood.
6. Adrenal Glands:
o Located on top of the kidneys. o Produce corticosteroids (e.g.,
cortisol) and catecholamines (e.g., adrenaline).
1. Corticosteroids
2. Catecholamines
Understanding Endocrine Conditions
Pituitary and Hypothalamus Disorders
● Hypopituitarism:
o Deficiency of one or more pituitary hormones. o the pituitary
gland does not produce enough of some of its hormones
▪ (e.g., TSH, GH, ACTH, follicle-stimulating hormone [FSH],
luteinizing hormone [LH], prolactin, melanocyte-stimulating
hormone, antidiuretic hormone [ADH], and oxytocin). o
panhypopituitarism —> pituitary gland does not produce any
hormones
o Manifestations : Decreased LH and FSH levels in children cause
delayed puberty.
▪ Premenopausal women experience amenorrhea, decreased
libido, regression of secondary sex characteristics, and
infertility.
▪ In men, erectile dysfunction, testicular atrophy, decreased
libido, regression of secondary sex characteristics, and decreased
spermatogenesis. o Cause —> Congenital defects (e.g., pituitary
hypoplasia or aplasia), ▪ Cerebral or pituitary trauma (may be a result
, of surgery, infections, stroke, radiation, or injury) Autoimmune
conditions (e.g., hypophysitis)
▪ Infections of the brain and tissues that support the brain
Tuberculosis Pituitary tumors (e.g., adenoma and
craniopharyngioma)
▪ Hemochromatosis (a condition resulting in excessive iron
absorption) Histiocytosis X (an abnormal immune condition
that results in tissue damage)
▪ Sarcoidosis (an abnormal inflammatory condition that results in
tissue damage) Hypothalamic dysfunction or tumors (e.g.,
craniopharyngioma, meningioma, or metastatic tumor)
o Complications: Can cause:
▪ Dwarfism: Short stature caused by deficient levels of growth
hormone.
▪ Diabetes Insipidus: Excessive fluid excretion in the kidneys due
to deficient antidiuretic hormone (ADH) levels.
● Hyperpituitarism:
o Excessive secretion of pituitary hormones.
▪ pituitary gland secretes excessive amounts of one or all of the
pituitary hormones.
o Cause : tumors (e.g., adenoma) that secrete hormones or
hormonelike substances.
o Clinical manifestations : vary greatly depending on the hormones
affected and the severity of those alterations.
▪ Prolactin-secreting pituitary tumors (i.e., prolactinomas) are the
most frequent secretory pituitary tumors.
1. Hyperprolactinemia results in menstrual dysfunction and
galactorrhea (inappropriate lactation).
▪ o Complications: Can lead to conditions like gigantism and
acromegaly.
▪ Gigantism refers to tall stature caused by excessive GH levels
prior to puberty
▪ Acromegaly describes increased bone size caused by excessive
GH levels in adulthood
, 1. can be a result of increased levels of GHRH from a
hypothalamic tumor.
▪ Excessive ACTH production results in Cushing syndrome.
▪ Syndrome of inappropriate antidiuretic hormone (SIADH) results
from increased renal water retention caused by excessive ADH
levels.
Pancreas Disorders
● Diabetes Mellitus: resulting from defects in insulin production, insulin
action, or both.
1. Glucose is a vital energy source for the body, but insulin is
required for glucose to travel into the cell, where it can be
used.
o Risk factors - Pancreatic conditions (e.g., cystic fibrosis, pancreatitis,
hemochromatosis, and pancreatectomy), endocrine dysfunction (e.g.,
Cushing syndrome and acromegaly), exposure to toxins (e.g.,
rodenticides), and long-term use of certain medications (e.g.,
glucocorticoids, beta blockers, protease inhibitors, and niacin)
o Type 1 Diabetes: Autoimmune destruction of insulin-producing beta
cells.
1. develops when the body’s immune system destroys pancreatic
beta cells.
2. Type 1 DM cannot be prevented, and people with this disease
must obtain insulin delivered by injection or a pump to survive. 3.
o Type 2 Diabetes: Insulin resistance combined with relative
insulin deficiency.
1. Insulin resistance in the liver leads to the inability to suppress
glucose production, further contributing to excessive
hyperglycemia.
2. Over time, the pancreas may gradually lose its ability to
produce insulin.
Modules 9, 10 & 11
Endocrine Function
Anatomy and Physiology
Endocrine System
● Complex Messaging and Control System:
o Uses hormones secreted by glands located throughout the body.
o Hormones are classified or described in regard to action, source, or
chemical structure.
Key Glands of the Endocrine System
1. Pituitary Gland:
o Often referred to as the "master gland" because it controls other
endocrine glands.
o Produces hormones such as growth hormone (GH), prolactin, and
adrenocorticotropic hormone (ACTH).
1. (Growth hormone) GH
2. Prolactin
3. ACTH 2. Hypothalamus:
o Located in the brain. o Regulates the pituitary gland through
releasing and inhibiting hormones.
3. Pancreas:
o Functions both as an endocrine and exocrine gland. o Endocrine
Function: Secretes insulin and glucagon to regulate blood sugar levels.
4. Thyroid Gland:
, o Located in the neck. o Produces hormones such as thyroxine (T4)
and triiodothyronine (T3), which regulate metabolism.
1. Thyroxine 2.
Triiodothyronine 5. Parathyroid
Glands:
o Small glands located on the posterior surface of the thyroid gland.
o Produce parathyroid hormone (PTH), which regulates calcium levels
in the blood.
6. Adrenal Glands:
o Located on top of the kidneys. o Produce corticosteroids (e.g.,
cortisol) and catecholamines (e.g., adrenaline).
1. Corticosteroids
2. Catecholamines
Understanding Endocrine Conditions
Pituitary and Hypothalamus Disorders
● Hypopituitarism:
o Deficiency of one or more pituitary hormones. o the pituitary
gland does not produce enough of some of its hormones
▪ (e.g., TSH, GH, ACTH, follicle-stimulating hormone [FSH],
luteinizing hormone [LH], prolactin, melanocyte-stimulating
hormone, antidiuretic hormone [ADH], and oxytocin). o
panhypopituitarism —> pituitary gland does not produce any
hormones
o Manifestations : Decreased LH and FSH levels in children cause
delayed puberty.
▪ Premenopausal women experience amenorrhea, decreased
libido, regression of secondary sex characteristics, and
infertility.
▪ In men, erectile dysfunction, testicular atrophy, decreased
libido, regression of secondary sex characteristics, and decreased
spermatogenesis. o Cause —> Congenital defects (e.g., pituitary
hypoplasia or aplasia), ▪ Cerebral or pituitary trauma (may be a result
, of surgery, infections, stroke, radiation, or injury) Autoimmune
conditions (e.g., hypophysitis)
▪ Infections of the brain and tissues that support the brain
Tuberculosis Pituitary tumors (e.g., adenoma and
craniopharyngioma)
▪ Hemochromatosis (a condition resulting in excessive iron
absorption) Histiocytosis X (an abnormal immune condition
that results in tissue damage)
▪ Sarcoidosis (an abnormal inflammatory condition that results in
tissue damage) Hypothalamic dysfunction or tumors (e.g.,
craniopharyngioma, meningioma, or metastatic tumor)
o Complications: Can cause:
▪ Dwarfism: Short stature caused by deficient levels of growth
hormone.
▪ Diabetes Insipidus: Excessive fluid excretion in the kidneys due
to deficient antidiuretic hormone (ADH) levels.
● Hyperpituitarism:
o Excessive secretion of pituitary hormones.
▪ pituitary gland secretes excessive amounts of one or all of the
pituitary hormones.
o Cause : tumors (e.g., adenoma) that secrete hormones or
hormonelike substances.
o Clinical manifestations : vary greatly depending on the hormones
affected and the severity of those alterations.
▪ Prolactin-secreting pituitary tumors (i.e., prolactinomas) are the
most frequent secretory pituitary tumors.
1. Hyperprolactinemia results in menstrual dysfunction and
galactorrhea (inappropriate lactation).
▪ o Complications: Can lead to conditions like gigantism and
acromegaly.
▪ Gigantism refers to tall stature caused by excessive GH levels
prior to puberty
▪ Acromegaly describes increased bone size caused by excessive
GH levels in adulthood
, 1. can be a result of increased levels of GHRH from a
hypothalamic tumor.
▪ Excessive ACTH production results in Cushing syndrome.
▪ Syndrome of inappropriate antidiuretic hormone (SIADH) results
from increased renal water retention caused by excessive ADH
levels.
Pancreas Disorders
● Diabetes Mellitus: resulting from defects in insulin production, insulin
action, or both.
1. Glucose is a vital energy source for the body, but insulin is
required for glucose to travel into the cell, where it can be
used.
o Risk factors - Pancreatic conditions (e.g., cystic fibrosis, pancreatitis,
hemochromatosis, and pancreatectomy), endocrine dysfunction (e.g.,
Cushing syndrome and acromegaly), exposure to toxins (e.g.,
rodenticides), and long-term use of certain medications (e.g.,
glucocorticoids, beta blockers, protease inhibitors, and niacin)
o Type 1 Diabetes: Autoimmune destruction of insulin-producing beta
cells.
1. develops when the body’s immune system destroys pancreatic
beta cells.
2. Type 1 DM cannot be prevented, and people with this disease
must obtain insulin delivered by injection or a pump to survive. 3.
o Type 2 Diabetes: Insulin resistance combined with relative
insulin deficiency.
1. Insulin resistance in the liver leads to the inability to suppress
glucose production, further contributing to excessive
hyperglycemia.
2. Over time, the pancreas may gradually lose its ability to
produce insulin.
