Human ExcretionHuman Excretion

BreathingBreathing

What do we get rid of with the What do we get rid of with the respiratory system?respiratory system?– COCO22

– HH22OO

– Excess heatExcess heat

The LiverThe Liver

-breaks down red -breaks down red blood cellsblood cells

Recycles usable Recycles usable materialsmaterials

Produces urea Produces urea following amino following amino acid deamination acid deamination (nitrogen break (nitrogen break down)down)

Sweat GlandsSweat Glands

Water, salts, and Water, salts, and some urea diffuse some urea diffuse from bloodfrom blood

Excreated in Excreated in perspiration (used perspiration (used for temperature for temperature regulation)regulation)

Sweat is 98% HSweat is 98% H22O O and 2% salt and and 2% salt and ureaurea

Urinary SystemUrinary System

KidneysKidneys– Excretion of most Excretion of most

of urea made in of urea made in cellscells

– Control Control concentration of concentration of most constituents most constituents of body fluidof body fluid

KidneyKidney

NephronsNephrons– Filter and reabsorb bloodFilter and reabsorb blood

GlomerulusGlomerulus– Filters water, salts, urea, Filters water, salts, urea,

amino acids and glucose amino acids and glucose into into Bowman’s CapsuleBowman’s Capsule

As materials move As materials move through the tubule of through the tubule of nepheron water, minerals, nepheron water, minerals, and digestion end and digestion end products are reabsorbedproducts are reabsorbed

Urine is what is left and Urine is what is left and then leaves the kidneys then leaves the kidneys through ureters to the through ureters to the urinary bladderurinary bladder

Urinary BladderUrinary Bladder

Store urine until Store urine until is eliminated or is eliminated or expelled through expelled through the ureturs to the the ureturs to the urinary bladderurinary bladder

MalfunctionsMalfunctions

Kidney disease: Kidney disease: Malfunction of the Malfunction of the kidney or nepheronkidney or nepheron

Gout: inflammation Gout: inflammation in the joints in the joints associated with associated with uric acid uric acid production and production and depostion.depostion.