excretory system lesson 7. aim: how does the body filter the blood to keep it free of waste? do now:...
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Excretory SystemLESSON 7
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AIM: How does the body filter the blood to keep it free of waste?
Do Now:
Write heading and AIM in notebooks. Think about questions below and write answers in full sentences in your notebooks.
#1. Why is it important to take the trash out when it gets full?
#2. What happens if you do not take it out?
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Excretory System: Functions
Eliminates body wastes If not eliminated, wastes build up Can lead to illness or death
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Urinary System (part of Excretory System)
Rids blood of wastes Controls blood volume by removing
extra water
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Why is this important?Fluid levels in body must be
balanced (homeostasis)
Brain sends message to kidneys to either hold onto or get rid of water.
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Mid AssessmentHow does the Urinary System
work to maintain homeostasis within the body?
What does it mean when your urine is very yellow?
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Organs in Urinary SystemMain organ:
Kidneys
Bean-shaped
In your back
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Kidneys-> ureter-> urinary bladder-> urethraVIDEO
Urinary Pathway
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1. Filters blood
2. Regulates amount of water and other substances in blood.
3. Remove wastes in Urine.
Kidney Functions
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Kidneys cont.Filled with tiny filters called
Nephrons.
Over 1 million nephrons in each kidney
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Kidneys
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Collection and Release
Once the water and blood has been filtered, the rest of the waste is collected in the kidneys.
Ureter – tubes that lead from kidney to the bladder
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Collection cont.Bladder – stretchable container that
stores urine until it leaves body. Can hold up to .5 liters of waterSimilar to an inflated balloon
Urethra - channel for urine to flow out of the body
Question: What other organ is similar to the bladder; expands and shrinks depending on how much it is filled?
Answer: The Stomach
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Homework: Critical Thinking Questions Online
1.The walls of the urinary bladder are stretchy. What do you think is the advantage of having these stretchy walls?
2.If a person's urine is dark brown, what are two organs in the body that might not be functioning properly? Explain what might be wrong with the two organs.
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DiseasesWaste products not removed build up
and act like poison
Too much water in the body can lead to swollen body parts (ankles) or fluid build up around organs
Imbalance of salt. Body will try to restore this balance but if it can’t organs can be damaged.
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Diseases cont.A person can live without a kidney
and survive.
Remaining kidney makes up for the loss
If both fail, person needs blood filtered artificially with - Dialysis