EXCRETION - St. Dominic High School

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Transcript EXCRETION - St. Dominic High School

 The
removal of the metabolic waste
products produced by cells
 CO2
 H20
 Nitrogen
– (ammonia, urea, uric acid)
 Salts – NaCl
 Regulated
by nerves and hormones
Urinary System
1. Urinary System:
maintaining a stable
internal environment:
Fluid inside and
around cells  the
regulation of
chemicals in the blood
is done by the kidney
Human Urinary System
2 Kidneys  filter blood – remove wastes
1 artery brings blood to kidney
2 Ureters  carries urine to bladder
1 Bladder  urine storage
1 Urethra  takes urine out of the body
maintain H20, maintains salt, maintain
blood pH, maintain blood volume, rids
nitrogen waste
 Nephron = function unit of the kidney
Feed back mechanism
= blood volume and H20 levels
increase  urine production
will increase
Ex: if you sweat  lose H20  blood
volume decreases  stimulates brain 
sends signal to kidney to keep more H20
 less urine is made
kidneys filter all the blood
in the body approx. Every
45 minutes
99% of the water that
enters the bowman’s
capsule is reabsorbed
into the blood
Urine formation
All material that remains
after filtration and
reabsorption is called
made up of urea, excess
salts, and water
stored in the bladder until
released from the body
through the urethra
2. Integumentary System
 Largest organ in the body! – sense organ
 surrounds
 protects (water proof)
 regulates fluid, salt and urea by sweat
3. Liver
Important in maintaining homeostasis, makes
Makes bile
Help digest fats
Stores glucose and vitamins
Detoxifies toxins: ex: alcohol
Breaks down RBC’s
Breaks down amino acids – urea
 Nephritis
 Kidney stones
 Kidney disease
 Kidney transplant