Excretory System
Published on Nov 27, 2015
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PRESENTATION OUTLINE
FUNCTION: Eliminate waste
3 TYPES OF WASTE
- Ammonia
- Most toxic
- Requires lots of water to flush away
- Fish and amphibians
3 TYPES OF WASTE
- Urea
- Mammals
- Less toxic
- Requires metabolic energy to create
3 TYPES OF WASTE
- Uric acid
- Reptiles and birds
- Requires very little water
- Very non-toxic
FILTRATION
- Glomerulus
- RBC and proteins don't pass thru
- Driven by hydrostatic pressure
REABSORPTION
- Necessary filtrate absorbed back into blood
- Active transport
- In nephron and tubule
SECRETION
- Transports solutes into renal tubule to make urine
- Eliminates faster than filtration
EXCRETION
- Removal of metabolic waste
KIDNEY STONE
- Calcium deposit in nephron
- Painful to pass
- Sharp pain
- Bloody urine
PREVALENCE AND TREATMENT
- Surgery
- Taking lots of fluids
- Passing stones
- 13% in men
- 7% in women
NEPHROSIS
PREVALENCE AND TREATMENT
- 1 in 5000 experience nephrosis
- Variety of causes
- Change in diet
