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Urinary System. Can you hold it long enough for me to get through this lecture?. QUICK REVIEW OF ELIMINATION. Lungs eliminate CO2 Sweat glands eliminate excess heat, salt Digestive tract- indigestible solids, bacteria Urinary tract is the main system of elimination. A little vocab.

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Urinary system

Urinary System

Can you hold it long enough for me to get through this lecture?


Quick review of elimination
QUICK REVIEW OF ELIMINATION

  • Lungs eliminate CO2

  • Sweat glands eliminate excess heat, salt

  • Digestive tract- indigestible solids, bacteria

  • Urinary tract is the main system of elimination


A little vocab
A little vocab

  • Uria or Ur- urine

  • Cyst- bladder

  • Nephr or Ren- kidney

  • Dys- painful


  • Anuria

    • Without urine

  • Cystitis

    • Inflammation of the bladder

  • Dysuria

    • Painful urination

  • Hematuria

    • Blood I urine

  • Hydronephrosis

    • > water in kidney

  • Renal

    • Pertaining to kidney


The urinary tract
The Urinary Tract

  • Urinary tract consists of 2 kidneys, 2 ureters, one bladder and one urethra.

  • Kidney location:

    • Retroperitoneal

    • Dorsal wall of abdominal cavity

    • 12th thoracic and 3rd lumbar vertebrae

  • Urethra

    • 1.5 inches in women, 8 inches in men


  • Outer layer- Cortex

  • Inner layer- Medulla

  • Calyx- collects urine as it is formed, join together to form the ureter


  • Kidneys filter blood- 2, 000 L/day (500 gal)

    • remove waste products and reabsorb water, other valuable substances.

    • 1.5 L of urine/day

  • Metabolism produces toxic substances- esp nitrogen containing waste as a by-product of protein breakdown

  • We eliminate nitrogen as urea- water soluble




  • Urine is made in 4 steps collects ultra filtrate

  • Filtration

  • Reabsorption

  • Secretion

  • Excretion

    A urinalysis is the most common non-invasive medical test

    ordered


Diseases of the kidney
Diseases of the Kidney collects ultra filtrate

  • Acute Kidney failure- sudden loss of function

    • Causes: nephritis, shock, injury, heart failure or poisoning

    • Symptoms: anuria or oliguria. Uremia, nausea, coma, death

  • Chronic Kidney failure- gradual loss of function due to hypertension (high blood pressure) or endocrine disease

  • Cystitis- inflammation of the urinary bladder


Dialysis kidney transplant
Dialysis, Kidney transplant collects ultra filtrate

  • Hemodialysis- serves as an “artificial kidney” 2-3x/week for 2-4 hours

  • Peritoneal dialysis- uses patient’s own peritoneal lining to filter blood

  • Kidney transplant- need suitable donor. Only need one, but must take anti-rejection drugs for the life of the patient