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Chapter 22 Alterations of Hormonal Regulation Questions & answers latest update 2024/2025 with complete solution $11.49
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Chapter 22 Alterations of Hormonal Regulation Questions & answers latest update 2024/2025 with complete solution
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Chapter 22 Alterations of Hormonal Regulation Questions & answers latest update 2024/2025 with complete solution

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  • August 14, 2024
  • 27
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • chapter 22 alterations of hormonal regulation

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  • HEALTH MEDICAL
  • HEALTH MEDICAL

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Chapter 22: Alterations of Hormonal Regulation
-may fail to function properly
-may respond to inappropriate signals - ✔✔how can feedback systems fail?

-inability to produce or obtain an adequate quantity of required hormone precursors
-inability to convert precursors to the active hormone
-excessive or inadequate hormone production - ✔✔how may an endocrine gland dysfunction?

1. failure of feedback systems
2. dysfunction of an endocrine gland
3. altered hormone
4. ectopic hormone release - ✔✔what leads to too much or too little hormone?

-nonendocrine sites
-autonomous production
-no feedback mechanisms - ✔✔what is ectopic hormone release?

failure of target cell to respond to its hormone (hormone insensitivity) - ✔✔what is target cell
dysfunction?
%


-decrease in number of receptors
-impaired receptor function
-presence of antibodies against specific receptors
-antibodies that mimic hormone action
-unusual expression of receptor function - ✔✔what are receptor-associated disorders?

-inadequate synthesis of a second messenger (cAMP)
-failure of target cell to produce anticipated hormonal response:
-faulty response to hormone-receptor binding:
--failure to generate required second messenger
--abnormal response to second messenger - ✔✔what are intracellular disorders?

hyperfunction & hypofunction - ✔✔what are diseases of the posterior pituitary?

-antidiuretic hormone effects: too much
-examples of diseases: syndrome of inappropriate antidiuretic hormone (SIADH) secretion -
✔✔posterior pituitary disease: hyperfunction?

-antidiuretic hormone effects: too little

,-examples of diseases: diabetes insipidus (neurogenic, nephrogenic, dipsogenic) - ✔✔posterior
pituitary disease: hypofunction?

-ADH level = abnormally high
-causes: ectopic secretion of ADH; post-surgical & with some cancers
-water retention: ADH action on renal collecting ducts increases their permeability to water
-normal renal, adrenal, & thyroid function must exist w/ high ADH level - ✔✔syndrome of
inappropriate antidiuretic hormone (SIADH) secretion

CM & Dx:
-hyponatremia: sodium <135 mEq/L
-hypoosmolality: <280 mOsm/kg
-urine hyperosmolality
-hypervolemia
-weight gain
-serum sodium levels < 110-115 mEq/L (severe & sometimes irreversible neurologic damage)

Tx:
-correction of underlying caudal problems
-administration of hypertonic saline
-vaptans
%


-fluid retention between 800-1000 mL/day
-resistant or chronic SIADH: demeclocycline - ✔✔SIADH: CM, Dx, Tx

-insufficiency of ADH
-polyuria & polydipsia
-partial or total inability to concentrate urine
-inability of kidney to increase permeability to water:
--excretion of large volumes of dilute urine
--increase in plasma osmolality
--urine output: 8-12 L/day (normal output = 1-2 L/day) - ✔✔diabetes insipidus

1. neurogenic = insufficient amounts of ADH
2. nephrogenic = insensitivity of renal collecting tubules to ADH
3. dipsogenic = excessive fluid intake, lowering plasma osmolarity to point that it falls below threshold
for ADH secretion - ✔✔what are the types of diabetes insipidus?

CM:
1. polyuria, nocturia, continual thirst
2. low urine-specific gravity: <1.010

, 3. low urine osmolality: <200 mOsmL/kg
4. hypernatremia
5. diuresis

Dx: based on clinical manifestations above

Tx:
1. neurogenic: administration of synthetic vasopressin analog desmopressin acetate (DDAVO)
2. nephrogenic:
-tx of any reversible underlying disorders
-discontinuation of etiologic medications
-correction of associated electrolyte disorders
-administration of thiazide diuretic agents
3. dipsogenic: effective management of water ingestion - ✔✔diabetes insipidus: CM, Dx, Tx

hyperfunction and hypofunction - ✔✔what are diseases of the anterior pituitary?

hormone effectors:
-hyperpituitarism
-hypersecretion of GH
-hypersecretion of prolactin
%


examples of diseases:
-primary adenoma
-acromegaly
-prolactinoma - ✔✔anterior pituitary: hyperfunction?

hormone effects: hypopituitarism

examples of diseases:
-panhypopituitarism
-ACTH deficiency
-TSH deficiency
-FSH & LH deficiency
-GH deficiency - ✔✔anterior pituitary: hypofunction?

-absence of selective pituitary hormones or complete failure of all pituitary hormone functions
-pituitary is vascular & therefore vulnerable to ischemia & infarction - ✔✔anterior pituitary:
hypopituitarism

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