The Excretory System Mr. Harpers science mini lesson with audio
How your kidneys clean your blood
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v cellular waste cell Our bodies are made up of many different
types of living cells.
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v There are many billions of cells in our bodies. One cell is
too small to see without a microscope. cellular waste cell
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v Like all living things, our cells make waste (go to the
toilet). cellular waste cell
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Blood in the capillary cell Bloodflow in capillary cell
Cellular waste cell Cellular waste capillary Cells must get rid of
their waste or they will die. Cells get rid of their waste by
dumping it into the blood. Every cell lives next to a tiny blood
vessel (capillary).
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v v kidneys Blood carries the waste away to the kidneys where
the blood is filtered and cleaned.
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The kidneys remove the cellular waste from your blood.
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Blood flows through the kidneys where the waste is filtered
out. Urine flows to the bladder
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The cellular waste products are sent from the kidneys as urine
(a yellow liquid) in tubes called jjjjjjjjjjjjureters, or urine
tubes.
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The ureters take urine to a bag-like muscle called the bladder
where it is stored until we go to the bathroom.
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Every fifth grader should know that the kidneys clean the blood
(remove the cellular waste).
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Every fifth grader should know that the bladder stores urine
until we let it out in the toilet.
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Every fifth grader should know the kidneys are the main organs
in the excretory system, which is sometimes called the urinary
system. excretory system
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The excretory system removes cellular waste from the body. Its
often called the urinary system because urine is how the waste
leaves the body.
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Now lets see how much of the information you remembered.
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Lets review: What are the most important organs in the
excretory system?
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Lets review: The kidneys are the most important organs in the
excretory system.
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Lets review: What is the function (job) of the kidneys?
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Lets review: Kidneys remove cellular waste from the blood (
clean the blood ).
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Lets review: What happens to the waste after the kidneys remove
it from the blood?
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Lets review: Cellular waste goes as urine to the bladder then
into the toilet.
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You can learn more from this Brainpop cartoon: The Urinary
System