Lesson 12. The Body's Harmony: Understanding the Endocrine Orchestra

Endocrine system

internal communication network, secreting hormones that regulate growth, metabolism, and stress responses.

Urinary system

functions as the body's purification plant--eliminating toxins, maintaining fluid and electrolyte balance, and regulating blood pressure.

Adren/o or Adrenal/o

Adrenal glands

Adrenal glands produce

hormones such as cortisol, aldosterone, and adrenaline--key regulators of stress, metabolism, and blood pressure

"fight or flight" response

floods the body with adrenaline to boost energy and awareness.

Hypophys/o or Pituitar/o

Pituitary gland

“master gland”

pituitary gland

Pituitary gland function

secretes hormones that influence growth, thyroid activity, reproduction, and water retention

Thyroid/o or Thyroaden/o

thyroid

Parathyroid/o

parathyroid

The thyroid and parathyroid glands control

metabolism and calcium levels

Thyroid acts

like a thermostat, adjusting the body's energy production

Parathyroids ensure

calcium homeostasis--crucial for bone health and nerve transmission

Pancreat/o

Pancreas

Pancreas functions

aids digestion and regulates blood sugar through insulin and glucagon. It is central to one of the most pressing global health issues--diabetes

Oophor/o or Ovari/o

ovaries

Orch/o or Ocrhid/o

testes

Ovaries and testes function

produce sex hormones like estrogen, progesterone, and testosterone, influencing fertility, secondary sexual characteristics, and mood

Thym/o

thymus

Thymus functions

plays a crucial role in immune development during childhood by maturing T-lymphocytes, key soldiers in our immune defense.

Acromegaly

excessive secretion of growth hormone after puberty

Symptoms of acromegaly

enlarged hands, feet, jaw, and thickened skin; leads to joint pain, sleep apnea, and cardiovascular complications

Cause of Acromegaly

benign tumor on the pituitary gland (pituitary adenoma) and may go undiagnosed for years due to its gradual progression

Cushing syndrome

stems from chronic exposure to high cortisol levels, either due to adrenal tumors or prolonged corticosteroid use.

Hallmarks of Cushing syndrome

central obesity, a "moon face," purple striae (stretch marks), muscle weakness, and osteoporosis.

Treatments for Cushing syndrome

surgical tumor removal or tapering steroid medications

Type I diabetes is

autoimmune disease in which the pancreas produces no insulin.

Type I diabetes presentation

childhood with symptoms like excessive thirst, frequent urination, weight loss, and fatigue

Type II diabetes is

insulin resistance and eventual deficiency

Type II diabetes is linked to

obesity, poor diet, and sedentary lifestyles

Left uncontrolled, diabetes can lead to

kidney failure, blindness, amputations, and heart disease

Goiter

enlargement of the thyroid

Goiter can result from

iodine deficiency or autoimmune diseases like Hashimoto's thyroiditis and Graves' disease

Hyperthyroidism

particularly Graves' disease, manifests with weight loss, heat intolerance, palpitations, and exophthalmos

Exophthalmos

bulging eyes

Hypothyroidism

leads to fatigue, cold intolerance, depression, and weight gain.

Radioactive iodine uptake (RAIU) evaluates

thyroid function by measuring how much iodine the gland absorbs. It helps distinguish between types of hyperthyroidism.

Thyroid scans

performed after injecting a radioactive tracer, produce detailed images of thyroid size, shape, and nodules--differentiating between hot (overactive) and cold (potentially cancerous) nodules.

Hormone replacement therapy is used in

hypothyroidism or adrenal insufficiency

Hypothyroidism medication

levothyroxine

Adrenal insufficiency medication

hydrocortisone

What manages diabetes

Insulin therapy, lifestyle changes, and oral hypoglycemics

Surgical resection or radioactive iodine ablation may be required for

thyroid or adrenal tumors

Nephr/o or Ren/o

kidneys

Kidneys are the

central filters

Nephrons

tiny filtration units that remove toxins and conserve vital substances

Pyel/o

renal pelvis

Renal pelvis function

collects filtered urine before passing it to the ureters

Ureter/o

Ureters

What are ureters?

muscular tubes transporting urine to the bladder.

Cyst/o or Vesic/o

urinary bladder

Urinary bladder

stores urine until it is expelled through the urethra

Urethr/o

urethra

Urethra

expels urine outside of the body

Albuminuria

protein in the urine; hallmark of kidney damage

Albuminuria signals

that the glomeruli, tiny filters in the kidney, are leaking due to structural compromise.

Anuria

no urine production

Oliguria

very low urine output

Anuria and oliguria indicate

renal failure

Renal failure

when kidneys can no longer filter blood, waste accumulates, leading to electrolyte imbalances, uremia, and eventually, death without treatment.

Dysuria

painful urination

Dysuria is common in

urinary tract infections (UTIs), often caused by E. coli.

Glycosuria

glucose in the urine

Glycosuria signals

uncontrolled diabetes, as the kidneys can't reabsorb the excess glucose in blood.

Hematuria

blood in the urine

Hematuria may result from

kidney stones, bladder infections, or tumors.

Nephrolithiasis

kidney stones

Nephrolithiasis forms

when minerals in urine crystallize

Risk factors for Nephrolithiasis

dehydration, high-protein diets, and certain metabolic disorders

Cytoscopy

inserting a camera through the urethra into the bladder to inspect for tumors, stones, or inflammation. It is indispensable in evaluating hematuria or recurrent UTIs

KUB (Kidneys, Ureters, Bladder) X-rays

quick x-ray overview of urinary tract structure without contrast

IVP (Intravenous Pyelogram) and VCUG (Voiding Cystourethrogram)

uses contrast dye and X-rays, give detailed images of urinary flow and can reveal obstructions, reflux, or malformations

Dialysis

lifeline for patients with end-stage renal disease (ESRD). It performs the work of failed kidneys, removing waste, balancing fluids, and maintaining electrolytes

Hemodialysis

uses an external machine to filter blood through an artificial membrane

Peritoneal dialysis

uses the patient's own peritoneal membrane as a filter.

Lithotripsy

non-invasive procedure, uses shock waves to break kidney stones into smaller pieces, allowing them to pass through the urinary tract.

Urinary catheterization

used in acute urinary retention, surgical procedures, or for accurate urine output measurement in critically ill patients.

Renal transplantation

definitive treatment for kidney failure

Diabetes Mellitus

pancreatic disorder causing an increase in blood glucose levels