The Urinary System Chapter 15.

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Presentation transcript:

The Urinary System Chapter 15

Big picture functions of urinary system produces & expels urine (which ultimately. . . ) produces hormones excretion of metabolic wastes

Gross anatomy of urinary system kidneys ureters urinary bladder urethra

Internal anatomy of kidneys renal cortex: renal medulla: nephrons: renal pelvis: rich blood supply

The nephron

The kidneys are the chief osmoregulators in humans Kidneys maintain water balance & solute concentration in body fluids by filtration of blood: water, ions & other dissolved substances are removed from blood leaving just cells & large proteins in glomerulus & glomerular capsule reabsorption of water, nutrients (glucose & AA) & ions back into blood, concentrating filtrate secretion of substances not needed by body; final adjustments to concentration & composition of urine excretion of urine

Hormonal regulation of kidney function angiotensin II aldosterone atrial natriuretic peptide (ANP) antidiuretic hormone (ADH)

What kidneys do to maintain pH Remember this reaction?: CO2 + H2O  H2CO3  H+ + HCO3-

Malfunction: chronic kidney disease