Human Excretion

Breathing What do we get rid of with the respiratory system? What do we get rid of with the respiratory system? –CO 2 –H 2 O –Excess heat

The Liver -breaks down red blood cells -breaks down red blood cells Recycles usable materials Recycles usable materials Produces urea following amino acid deamination (nitrogen break down) Produces urea following amino acid deamination (nitrogen break down)

Sweat Glands Water, salts, and some urea diffuse from blood Water, salts, and some urea diffuse from blood Excreted in perspiration (used for temperature regulation) Excreted in perspiration (used for temperature regulation) Sweat is 98% H 2 O and 2% salt and urea Sweat is 98% H 2 O and 2% salt and urea

Urinary System Kidneys Kidneys –Excretion of most of urea made in cells –Control concentration of most constituents of body fluid

Kidney Nephrons Nephrons –Filter and reabsorb blood Glomerulus Glomerulus –Filters water, salts, urea, amino acids and glucose into Bowman’s Capsule As materials move through the tubule of nephron water, minerals, and digestion end products are reabsorbed As materials move through the tubule of nephron water, minerals, and digestion end products are reabsorbed Urine is what is left and then leaves the kidneys through ureters to the urinary bladder Urine is what is left and then leaves the kidneys through ureters to the urinary bladder

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

Malfunctions Kidney disease: Malfunction of the kidney or nephron Kidney disease: Malfunction of the kidney or nephron Gout: inflammation in the joints associated with uric acid production and depostion. Gout: inflammation in the joints associated with uric acid production and depostion.