excretory system
Post on 06-May-2015
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Excretory SystemExcretory System
ExcretionExcretion
Excretion is the Excretion is the removal of wastesremoval of wastes
Wastes from:Wastes from: Cellular respirationCellular respiration Digestion of foodDigestion of food Cellular activitiesCellular activities
SkinSkin
Your skin is very Your skin is very important to the important to the excretory system.excretory system.
Excretes excessExcretes excess WaterWater UreaUrea HeatHeat
What is Urea?What is Urea? A common metabolic A common metabolic
cellular waste product is cellular waste product is ammonia. ammonia.
It can raise the pH of It can raise the pH of blood.blood.
The human body can The human body can combine ammonia and combine ammonia and excess CO2 to make excess CO2 to make Urea.Urea.
Urea is very soluble in Urea is very soluble in water, making it an easy water, making it an easy way to excrete excess way to excrete excess nitrogennitrogen
Lungs?Lungs?
The lungs are an The lungs are an important organ of important organ of the excretory the excretory systemsystem
But what wastes But what wastes do they get rid of?do they get rid of?
Carbon DioxideCarbon Dioxide
Carbon Dioxide is Carbon Dioxide is a waste product of a waste product of cellular respirationcellular respiration
It makes the blood It makes the blood acidicacidic
Our body needs to Our body needs to get rid of itget rid of it
DiffusionDiffusion
We have no special We have no special process for CO2 process for CO2 removalremoval
Rely on simple Rely on simple diffusiondiffusion
AlveoliAlveoli High to low High to low
concentrationconcentration LungsLungs
LiverLiver
Liver is Liver is responsible for responsible for detoxification of detoxification of the bodythe body
It converts It converts ammonia to ureaammonia to urea
CirrhosisCirrhosis
Scarring of the Scarring of the liverliver
Usually caused by Usually caused by alcoholismalcoholism
Large IntestinesLarge Intestines
Removal of water Removal of water from solid wastesfrom solid wastes
Excretion of solid Excretion of solid wasteswastes
The act of The act of defecation is not defecation is not considered a part considered a part of excretory of excretory systemsystem
KidneysKidneys
Kidneys are the Kidneys are the most important most important organ of the organ of the excretory systemexcretory system
Regulate pH of the Regulate pH of the bloodblood
Remove excess Remove excess water, and urea to water, and urea to create urinecreate urine
Urinary SystemUrinary System
Kidneys feed Kidneys feed UreterUreter
Ureter connects to Ureter connects to BladderBladder
Bladder stores Bladder stores urineurine
Excreted through Excreted through UrethraUrethra
Excretion and Excretion and HomeostasisHomeostasis
Excretion is essentially a process of Excretion is essentially a process of maintaining homeostasismaintaining homeostasis To maintain a constant internal To maintain a constant internal
environment all metabolic wastes need environment all metabolic wastes need to be removedto be removed
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