The Urinary System

4 Main Components of Urinary SystemKidneys: Make the urine

UretersBladderUrethra

Carries urine to outside of body

How do you know you’re talking about making urine?

Uri-

Uro-

Ure-

Renal

Nephro-

•The 2 kidneys receive between 1100 – 2000 liters (upwards of 500 gallons) of blood per day…about the volume of a car!

•But… the human body only holds about 5.6 liters of blood.

•Therefore… your blood travels through the kidneys to be cleaned about once every 4 minutes

1.Help rid wastes from the blood• Urea: main nitrogenous (N2) containing

compound• Toxins: drugs

2.Regulate the volume and chemical makeup of blood

• Maintain a good blood pressure• Proper ions (Na, K, Cl, bicarbonate)• Proper pH

3.Release hormones• Renin: helps regulate blood pressure

• Erythropoietin: stimulates production of red blood cells (RBCs)

• Converts Vitamin D to its active form

On the outside:•Maroon/brown

•Covered with a shiny capsule, then surrounded by fat capsule (protection)

•5 inches long, 3.5 inches wide, 1 inch thick (large bar of soap)

•Indentation on one side (renal hilus) containing:•Renal artery•Renal vein•Ureter

On the inside:•Cortex: outer layer, “rind”

•Renal pyramid: made up of medulla

•Renal lobe:

•Renal pyramid plus overlying cortex

•Site of urine production

Urine

Urine

Urine

On the inside:Drainage of urine…•Minor calyx

•Major calyx

•Renal pelvis

•Ureter

NaCl

HCO3H2O

AminoAcids

Glucose

Drugs/Poisons

H+

NaCl

NaClH2O

H2O

H2ODrugs/Poisons H+

NaCl

HCO3